Summer Underwear Collection Planning: Seasonal OEM Production Timeline

A summer underwear collection needs seven to eight months from design brief to retail floor set – about six months from brief to warehouse receipt – and the date that decides whether you get it is not the ship date but the sample-approval date. For a March to April floor set the design brief has to open in August or September, sampling has to finish in October, bulk production has to run through December ahead of the Chinese New Year shutdown in February, and the container has to sail in January. Miss October and every later step slips in sequence; there is no stage in the chain that can absorb three lost weeks without the retail window paying for it.

This page sets out the calendar working backwards from the floor set, marks which phases can be compressed and at what cost, and treats the Chinese New Year shutdown as a scheduling constraint rather than a surprise. The dates below are for a northern-hemisphere spring/summer season with delivery on an FOB or CIF basis; southern-hemisphere calendars simply shift the season and keep the same structure.

1. How far ahead does a summer collection actually have to start?

Seven to eight months before the floor set, which is about six months before the goods reach your warehouse and five months before the vessel sails. The chain has four blocks, and each has a floor:

The mistake in most late collections is not a slow factory. It is a sampling phase that was budgeted as one round and consumed three, because nobody counted the calendar days between sending a comment sheet and receiving the revised sample. Each round is not four weeks of work; it is four weeks of work plus the days the sample spends in transit plus the days your own team takes to comment.

2. What is the working-backwards calendar from the floor set?

Build the calendar from the floor-set date backwards, then check it against the two fixed external constraints: the Chinese New Year shutdown and the sailing schedule you can actually book.

Read the table as a chain of gates rather than a list of activities. A gate that closes late does not delay the next activity by the same amount; it delays it by the amount plus the next available slot, because sampling lines and production lines are booked in sequence. This is why a two-week slip in October usually lands as a four-week slip in March.

3. What does Chinese New Year do to the schedule?

The 2027 Spring Festival falls on Saturday 6 February, and the statutory holiday period around it is set by the State Council each year rather than fixed, so confirm the notice for your production year before you commit the calendar. In practice the disruption is wider than the holiday itself:

• Before the holiday: mills and dyehouses close bookings early to clear their order books, and factories push to ship before the cut-off, so the two or three weeks ahead of the holiday are the tightest capacity of the year.
• During the holiday: production stops. Orders that were not completed ship late or not at all.
• After the holiday: labour return is staggered, so the first two or three weeks back run below full capacity even though the factory is formally open.

Whatever the exact holiday dates, the consequence for a March floor set is precise: bulk production has to be finished before the holiday, which means a 45 to 60 day run has to start by the first week of December, which means the PPS has to be approved in late November, which means the second fit round has to be complete in early November. A buyer who places a spring order in January is not ordering a spring collection; they are ordering a summer collection.

4. Which phases cannot be compressed?

Everything can be compressed a little; almost nothing can be compressed safely. The table below is the honest version.

The useful rule is that compression should be taken from the phase you control and never from the phase that produces evidence. A collection that skips a fit round and passes inspection is a collection that will be reworked in season; a collection that starts three weeks earlier is simply on time.

5. What has to be booked before sampling ends?

Three things, and all three are booked against a date rather than against an approval:

1. The production slot. Booking before samples are approved feels premature and is standard practice; the slot can be moved once, and a slot that was never booked cannot be conjured in December.
2. The fabric, or at least the yarn. A yarn-dyed stripe needs its yarn colours booked earlier than a solid, because each colour carries its own dye lot. For a printed design the base fabric still has to be reserved, and the cost difference between a yarn-dyed stripe and a print is set out in the knitted cotton fabric price comparison.
3. The inspection window. Third-party inspection capacity also tightens before the holiday, and an inspection booked late is an inspection performed after the container was stuffed.

If you are placing a first order with a new supplier, the booking conversation is also the moment to settle the commercial frame: minimum quantity per style per colour, payment structure, and who bears the cost of a missed sailing date. On custom OEM underwear our standard minimum is 2,000 pieces per style per colour with sizes mixed inside a style, and 3,000 pieces per style per colour for licensed categories; the bulk window is 45 to 60 days on a new order. Those numbers are what the calendar in section 2 is built on, and they sit alongside the wider contract manufacturing and low-MOQ terms.

6. How do you protect the delivery date when the fabric is late?

Fabric is late more often than sewing is slow, and the reason is structural: a mill books in queue positions, and a queue position moves. Four protections, in order of value:

• Split the order by colour. Ship the colour whose fabric is ready and let the balance follow, rather than holding the whole order for the last shade. The DC receives a partial range on time instead of a full range late.
• Fix the sailing, not the ship date. A confirmed booking with a named vessel is a constraint the factory can plan against; “ship as soon as possible” is not.
• Write the missed-sailing consequence into the order. The clause should say who pays for the air freight premium and within what window the decision is made, because after the fact it becomes a negotiation.
• Keep one colourway on stock fabric. A core black or white carried on a stock quality gives you something to ship in the launch week even if the fashion shades are late.

7. What changes for a reorder in season?

The reorder is the easiest order in the calendar and the one most often misplanned, because buyers apply the new-order timeline to it. A reorder of an approved style runs 30 to 40 days in production rather than 45 to 60, and it needs no fit rounds at all. What it does need is a decision about fabric: if the original dye lot is exhausted, the reorder carries a shade difference, and that difference has to be accepted in writing before production rather than discovered at the DC.

Two planning notes follow. First, the in-season reorder window closes earlier than the calendar suggests, because the factory’s line is committed to the next season’s development by the time your sell-through data is reliable. Second, a reorder placed on the strength of two weeks of sales data is a bet; a reorder placed on four weeks is a plan. The dates that make this workable: sell-through becomes readable in week four of the season, and a reorder needs to be placed about ten weeks before the date you want the goods back in the DC, which for a summer season means late May at the latest.

8. Which documents travel with a seasonal shipment?

The document set is standard, and the seasonal shipment adds nothing except time pressure. What matters is that the set is complete before the vessel sails, because a missing certificate stops a container more reliably than a late one.

• Commercial invoice and packing list, with the style, colour and size breakdown matching the inspection report.
• Bill of lading, consistent with the Incoterms 2020 rule named in the order – FOB Xiamen is our standard basis, and the risk transfer point follows from it.
• Certificate of origin where the destination requires or prefers it.
• Test reports for the finished article, not for the greige fabric: colour fastness to washing and to rubbing, restricted substances, and the OEKO-TEX Standard 100 certificate at product class II where the buyer relies on it.
• Care labelling content compliant with 16 CFR 423 for the United States and using ISO 3758 symbols where the market reads them.
• Inspection report against ISO 2859-1 at the AQL written in the order – read it with the field-by-field method for an underwear inspection report.

9. How do you build slack into a 45 to 60 day production window?

Not by adding days at the end. Slack is created at three points, and each is cheap if it is planned and expensive if it is improvised:

1. Before cutting. Fabric in house and approved, trims and labels in house, and the size breakdown confirmed. Most production delays are pre-production delays wearing a production label.
2. At the in-line check. A check after the first few hundred pieces catches a construction error while it is still cheap to correct; the same error found at final inspection is a rework decision.
3. At the booking. A sailing date two weeks after the planned completion, rather than the first available one, absorbs the ordinary slippage without touching the retail window.

The wider version of this question – how much buffer a whole supply chain needs, and where the break points are over a four-month cycle – is covered in the 120-day cycle. What slack is not: a promise that the factory will work faster. On a 45 to 60 day window the last two weeks are finishing, inspection and packing, and none of those stages get shorter because the goods are needed.

10. What does this look like on our side?

Unitex is a sourcing and trading company: we place custom OEM production with partner factories in the Xiamen-Quanzhou-Jinjiang knitwear cluster that hold amfori BSCI and OEKO-TEX Standard 100, and we build the calendar above with the buyer rather than after the buyer asks. In practice that means a written reverse calendar with the gates named, a booking made before sampling closes, and a documented decision point on fabric so the sailing date is not the first place the delay appears; the payment structure that keeps the balance behind inspection is set out in the payment terms page. We will tell you which gate you are already past – that conversation is more useful in September than in January.

Next step: take your floor-set date, subtract nine months, and put the resulting week in the calendar as the design-freeze date. Then check whether the Chinese New Year that falls inside your production window is early or late, because an early Spring Festival removes two working weeks from the exact month you were counting on. If you are planning a summer 2027 collection, the 6 February date is the constraint that sets your December order cut-off.

Last updated: 2026-10-31 · Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing partner

Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — OEM/ODM underwear sourcing and supply-chain partner in Xiamen, China; in the trade since 2009, incorporated in 2013. Based in the Xiamen–Quanzhou–Jinjiang knitwear cluster, Fujian Province, south-east China.