Trench Coats Sizing and Grading Guide for Sourcing Agencies: Winter 2026 Guide No.497

Demand for trench coats in South Korea builds earlier every year, and buyers who lock in production by late summer are the ones who avoid air freight. This guide for Sourcing Agencies sets out what to check, what to ask and what to document before you place an order.

Quality Control

Insist on a pre-shipment inspection against an AQL plan, with the report sent to you before the goods leave. Book an in-line inspection at 30 percent completion: that is the cheapest moment to fix a problem. Measure a full size set against the graded spec sheet, and record every deviation, however small. The critical test for trench coats is water repellency and colour stability, and it should be run on the production batch, not on a golden sample.

What Goes Into the Garment

For trench coats, the construction matters as much as the fabric: watch the storm flap and belt hardware. Cheap substitutes usually appear in the lining and the trims, so inspect those areas first. A soft hand feel and a stable hand feel are different things; ask for both after three washes, not one. A good trench coat starts with the water-repellent cotton gabardine, so agree the material grade before you discuss price. The performance buyers pay for is wind and light rain protection, and it comes from the water-repellent cotton gabardine combined with careful make-up.

Choosing the Right Supplier

Confirm who owns the pattern and the grading, especially if you intend to reorder the same block next season. Request the production schedule before you pay the deposit, so you can see where your order sits. Visit or video-audit the line; a five-minute walk-through reveals more than a page of certificates. Ask for the names of two buyers already running trench coats programmes and speak to them directly. Ask the factory how many trench coats lines it runs and whether your order shares a line with another buyer.

Market Demand and Season Timing

Peak demand for trench coats runs from October through February, so the buying window closes earlier than most new buyers expect. Retailers in South Korea typically finalise trench coats assortments in spring, which means samples should be approved before the summer break. The strongest trench coats programmes share one habit: they are planned against a calendar rather than against a departure date. Since trench coats are a seasonal category, late delivery is worse than a small price increase, because unsold stock has to be carried for a year. Cold-weather categories sell on trust, and trench coats are no exception: a single batch that underperforms can cost a whole retailer relationship.

Order Planning and Lead Time

Book capacity in advance for peak months; a factory that is full in September cannot rescue a late October order. Split large programmes into two or three deliveries so that early stores are fed and later stores are not overstocked. Build a buffer of seven to ten days between the ex-factory date and the sailing date for the unexpected. Keep a second qualified factory on file, because a single-source season carries avoidable risk.

Cost and Price Structure

A small increase in fill weight or yarn count changes the cost meaningfully, so price two specifications side by side. Watch the exchange rate and the raw material index, because both move the cost of trench coats during a long season. Freight, duty and inland handling can add more than the factory price difference, so compare landed cost, not FOB.

Final Checklist

If you sign the specification, seal the sample, book the inspection, confirm the packing and file the documents, the order takes care of itself.