Planning Flow After Order Confirmation: How Real Garment Factories Turn a PO into a Shipment

Once a garment order is confirmed, the factory floor does not immediately start running machines. There is a lot that has to happen first.

The purchase order may look straightforward: a quantity, a style, a price and an ex-factory date. But behind that order is a chain of decisions involving capacity, fabric, cutting, sewing lines, manpower, quality, production targets and shipment planning.

A delay that appears at the end of the order often starts much earlier. Sometimes it begins with an unrealistic efficiency assumption. Sometimes a fabric delivery is planned too close to the sewing date. In other cases, the factory simply loads too many orders onto the same production lines.

For that reason, the first few days after order confirmation are extremely important. The planner has to turn the buyer's PO into a schedule that the factory can actually execute.

To make the process easier to follow, this article uses one working example throughout: a 120,000-piece knit T-shirt order.

The Order: Our Working Example

Let's follow one order from confirmation through production planning.

Using one order throughout the article makes it easier to see how one planning decision affects the next.

The numbers are not there just to fill an Excel sheet. Each one affects the production schedule.

1. Delivery Backward Planning: Where the Schedule Begins

One of the first things a planner does after receiving the confirmed order is look at the ex-factory date.

The factory cannot simply start from the current date and keep adding activities until it reaches shipment. The ex-factory date is already fixed. The planning team therefore works backward from that date.

A typical sequence looks like this:

1. Ex-factory date
2. Final inspection and packing
3. Sewing completion
4. Sewing start
5. Cutting
6. Fabric in-house and relaxation

For our example, the ex-factory date is 25 May.

Suppose the factory needs about three days for final inspection and packing. Sewing should therefore be completed around 20 May.

The sewing duration is then calculated from the available capacity. Once the sewing start date is known, the planner works further backward to determine the cutting date and the date by which fabric must be available.

This backward calculation is important because the different departments are connected.

If sewing starts late, cutting has less time.

If cutting starts late, fabric has to arrive earlier or the sewing start will move.

If fabric arrives late, the entire production sequence can be affected.

A useful rule for the planning team is to freeze the sewing window first and then build the supporting activities around it. Otherwise, sourcing, cutting and production may all work with different dates.

2. Capacity Planning: Can the Factory Actually Make the Order?

Once the order is confirmed, the planner needs to answer a very basic question:

Do we have enough production capacity to make 120,000 pieces within the available time?

This calculation should happen early. It should not wait until materials have already arrived.

The main inputs are:

• Order quantity

• SMV (Standard Minute Value)

• Number of operators

• Working hours per day

• Planned efficiency

• Number of available sewing lines

• Factory working calendar

• Existing production commitments

• Holidays and maintenance periods

Capacity Calculation

For this example, use the following assumptions:

Now calculate the capacity.

Step 1: Available Minutes

Each line has 50 operators working 10 hours per day.

Daily minutes = Operators × Working Hours × 60

50 × 10 × 60 = 30,000 minutes

That is the theoretical working time available on one line.

Step 2: Earned Minutes

The line is not expected to operate at 100% efficiency.

At 65% efficiency:

Earned minutes = 30,000 × 65%

= 19,500 minutes

Step 3: Daily Production

The SMV for the T-shirt is 9.5 minutes.

Daily output = Earned minutes ÷ SMV

19,500 ÷ 9.5 = approximately 2,052 pieces per line per day

So, for planning purposes, one line can produce roughly 2,050 pieces per day under these assumptions.

Step 4: Calculate the Number of Sewing Days

Suppose the factory assigns eight lines to this order.

Combined daily output = 2,052 × 8

= approximately 16,416 pieces per day

Now divide the order quantity by the combined daily capacity:

120,000 ÷ 16,416 = approximately 7.3 days

The factory therefore needs about 8 productive sewing days.

That number is useful, but it should not automatically become the production window in the master plan.

Why?

Because the calculation assumes the lines are working close to the planned efficiency. Real production does not always behave that neatly.

There can be startup losses, operator changes, machine problems, style adjustments, bottlenecks and days when the line simply performs below target.

That is why a planner normally needs some room around the calculated production requirement.

A capacity plan that assumes 85% efficiency when the line normally performs around 60-65% may look excellent in Excel. It becomes a problem when production starts.

3. Master Production Planning (MPP)

After the factory confirms that the order can be produced within the available capacity, the next step is to put the order into the Master Production Plan (MPP).

The MPP becomes the main reference for the departments involved in the order.

For our example, the plan could look like this:

The capacity calculation indicated around eight productive sewing days. The MPP gives the factory a longer calendar window, from 5 May to 17 May, rather than assuming that every day will run exactly according to the theoretical calculation.

That difference matters.

The extra time can absorb some of the problems that appear during real production, including:

• Startup losses

• Line balancing issues

• Operator movement

• Minor machine problems

• Style-change effects

• Quality interruptions

• A weaker production day

The MPP also gives different departments one common schedule.

Production knows when the style is expected to run.

IE knows when the line needs to be prepared.

QA knows when inspections and quality activities will be required.

Sourcing knows when materials must be ready.

Without a common production plan, departments can easily end up working from different dates. Production may think sewing starts on 7 May while sourcing is still working toward a 10 May material-arrival date.

That is how small planning differences become production problems.

4. Line Loading Planning

The MPP says that eight lines are required. Line loading takes that decision one step further.

Now the planner has to decide exactly where the order will run.

For example:

There is an important idea behind keeping Line 9 free.

A buffer line is not necessarily wasted capacity.

If one of the eight production lines develops a serious problem, the unused capacity gives the factory another option. The planner may be able to shift work, add production time or use the spare line rather than immediately moving the shipment date.

Of course, whether a buffer line is practical depends on the factory's overall order book. A factory with every line fully committed may not have this luxury.

Still, the principle is useful: planned capacity should include some protection against normal production disruptions whenever possible.

5. Material Planning: Running Alongside Capacity Planning

Capacity planning and material planning should not happen one after another.

They need to move together.

A factory may have enough sewing capacity but still miss the shipment because the fabric arrives late. The opposite can also happen: all the fabric is sitting in the factory while the sewing lines are already committed to another order.

For the 120,000-piece T-shirt order, the material plan might look like this:

The fabric is planned to arrive on 10 April, while sewing is scheduled to start on 5 May.

That gives the factory several weeks between fabric arrival and sewing.

The time is useful for activities such as:

• Fabric inspection

• Fabric relaxation

• Quality checking

• Shade or lot verification

• Cutting preparation

• Handling any material issue before bulk sewing begins

Knit fabric in particular may require relaxation before cutting. If that step is rushed, dimensional changes can create problems later in the garment.

The important point is not simply "fabric must arrive before sewing."

It is that material should arrive early enough to be checked and prepared before production needs it.

Another practical rule is to avoid starting bulk sewing when important materials are still missing.

Starting with partial materials can create interrupted production, WIP accumulation and unnecessary handling. A line may produce part of the order and then stop because a required trim or component is unavailable.

That creates a problem that did not exist in the original production plan.

6. Pre-Production Planning (PPP)

Before bulk production starts, the factory needs to make sure the style is actually ready to run.

This is where Pre-Production Planning (PPP) becomes important.

A confirmed purchase order does not automatically mean the factory is technically ready for bulk production.

The PPP stage normally brings together production, IE, QA and other relevant teams.

Main PPP Activities

The planning team checks items such as:

• PP sample approval

• Buyer approval of the required construction

• Pre-production meeting

• Operation breakdown

• SMV validation

• Line layout

• Machine requirements

• Quality requirements

• Production readiness

The operation breakdown is particularly important for capacity planning.

The original capacity calculation used an SMV of 9.5 minutes.

But an SMV written in a planning sheet is only useful if it reflects the actual production method.

If the real operation breakdown shows that the garment requires more time than expected, the line's actual capacity will be lower.

That can change the number of production days required.

The main outputs of PPP should therefore include:

• Approved operation bulletin

• Balanced line layout

• Required machine setup

• Production-ready confirmation

This is one reason why rushing the pre-production stage can create trouble later. A small technical issue discovered before sewing is usually much easier to solve than the same issue discovered after thousands of pieces have entered the line.

7. Daily Production Control: The Plan Has to Be Updated

Once sewing begins, planning does not stop.

The factory now has actual production data, and that data needs to be compared with the original plan.

A simple daily production-control sheet could look like this:

On the first day, Line 1 produced 150 pieces less than planned.

That does not automatically mean the order is in trouble.

The second day tells a different story. The line produced 2,020 pieces, slightly above the 2,000-piece target.

The planner's job is to watch the trend rather than react emotionally to one number.

A first-day shortfall can be normal because operators are still settling into the style and the line is being balanced.

But a repeated shortfall is different.

If the same line produces 150 pieces below target every day, the planner needs to find out why.

Possible actions include:

• Moving manpower

• Rebalancing operations

• Addressing a bottleneck

• Checking machine availability

• Reviewing quality losses

• Adjusting the production target

• Using available buffer capacity

This is where production planning becomes a continuous activity rather than a document prepared once at the beginning.

A 150-piece shortage on one day may be manageable.

If the same shortage continues for eight days, the factory is looking at a 1,200-piece gap.

That is large enough to affect the shipment plan.

8. Wrong Planning vs. Correct Planning

The difference between good and bad planning is not the number of Excel sheets a factory maintains.

The real difference is whether the assumptions inside those sheets match what happens on the factory floor.

The efficiency assumption is worth looking at closely.

Suppose a planner calculates capacity using an efficiency level that the line rarely achieves. On paper, the order may appear to need only a certain number of days.

Then production starts.

The actual efficiency is lower.

The daily output falls.

The production gap grows.

The planner starts looking for overtime or additional lines.

Eventually, the factory may have to consider expensive recovery options such as additional shifts or airfreight.

The problem did not necessarily begin on the production floor. It may have started with an unrealistic assumption in the original capacity calculation.

This is why historical production data is valuable. A planner should know what the relevant lines have actually achieved on similar products rather than selecting an efficiency percentage simply because it makes the schedule fit.

Key Takeaways

A few principles stand out from the complete planning flow.

1. Start capacity planning immediately

Once the PO is confirmed, the factory needs to know whether the available sewing capacity can support the order.

Material planning should begin at the same time.

2. Work backward from the shipment date

The ex-factory date is the fixed point. Sewing, cutting, material arrival and other activities have to fit around it.

3. Use realistic efficiency

The difference between theoretical capacity and actual factory capacity can be significant.

A realistic assumption is more useful than an impressive-looking Excel calculation.

4. Keep some protection in the plan

Where factory capacity allows it, a buffer line or additional time can provide useful protection against normal disruptions.

5. Make sure the material is ready before production needs it

Fabric and trims should not arrive at the same moment the sewing line is expected to start. The factory needs time for inspection, preparation and problem solving.

6. Treat PPP as a production-readiness check

The approved sample, operation breakdown, SMV, machine setup and line arrangement all need to be ready before bulk production.

7. Monitor production every day

The production plan is not finished when the Excel file is saved.

Actual output needs to be compared with planned output, and deviations need to be addressed while they are still small.

Conclusion

Garment production planning is often misunderstood as an exercise in preparing schedules and updating Excel files.

In reality, it is about connecting a buyer's delivery requirement with the physical limits of the factory.

For the 120,000-piece T-shirt order used in this example, the process begins with the 25 May ex-factory date. The planner works backward, calculates sewing capacity using the 9.5-minute SMV, determines that approximately eight lines are needed, builds the master production plan, assigns the lines, checks material readiness, confirms technical readiness through PPP and then follows actual production every day.

None of those steps is particularly complicated on its own.

The difficulty comes from making all of them agree with each other.

A capacity calculation that ignores real efficiency can create a problem later. A material plan with no safety margin can stop production. A production plan without daily monitoring can become outdated within a few days.

Good planning reduces those risks before they become visible as shipment problems.

And that is probably the most important lesson: a shipment delay often starts long before the factory knows there is a delay.

The planner's job is to find that risk while there is still enough time to do something about it.

Strong planning is not about making the schedule look perfect.

It is about making the schedule workable.