Sourcing a shirt manufacturer is a risk-management exercise. The cost of picking the wrong partner is not the unit price you pay — it is the rework, the missed season, and the reputation you lose with your own customers. This guide gives you a repeatable seven-step screen you can run before you commit a single purchase order.
Step 1: Separate the trading company from the factory
Many suppliers you meet at a trade show are trading companies with no production floor of their own. That is not automatically disqualifying — a good trading partner can manage complex programs well — but it changes your risk profile. A trader adds a margin layer and removes your direct visibility into the line.
Ask directly: how many sewing lines run in-house, and who owns the cutting table? A factory can answer in specifics (line count, daily output, machine types). A trader tends to answer in ranges and deflections.
Step 2: Confirm the factory is licensed to export
Request the business licence and the export registration. Check that the registered scope covers apparel manufacturing, and that the legal entity name matches the bank account you will pay. Mismatches here are one of the most common causes of payment disputes.
Step 3: Map the real production capacity
Capacity is not a number on a website. Ask what share of the floor is dedicated to shirts, what the monthly shirt output is at current staffing, and how many lines would be assigned to your order. Then sanity-check: a factory claiming 200,000 shirts a month across three lines is telling you something inconsistent.
Step 4: Test sampling discipline, not just sample quality
Anyone can produce one beautiful sample. What matters is whether the sample arrives with a written spec that matches what you asked for. Compare the sample against your tech pack field by field: fabric weight, yarn count, collar interlining, stitch density, button type, label placement.
A supplier who sends a good shirt but cannot document how they made it will struggle to repeat it at volume.
Step 5: Ask how they handle a rejected batch
This question separates mature factories from the rest. A mature answer covers inspection standard (AQL level), who bears the cost of a failed inspection, the rework timeline, and whether they will hold the goods. A weak answer is "we never have defects."
Step 6: Check certifications against real buyers
Certificates are easy to buy. Instead of a wall of framed documents, ask for two or three references from buyers in your own market and, ideally, your own product category. Then use them.
Step 7: Score the supplier, do not feel it
Put every candidate on the same scorecard so the decision is comparable:
- Production fit — do they actually make what you are buying?
- Documentation — spec sheets, inspection reports, traceability
- Communication — response time and clarity during the screen itself
- Commercial terms — MOQ, payment, lead time realism
- Risk — any mismatch found in steps 1–6
Red flags that should stop the process
- Refuses a live video walkthrough of the production floor
- Cannot name a single current buyer reference
- Quotes a price far below every other quote with no explanation of how
- Legal entity name does not match the bank account
- Answers technical fabric questions with marketing language
The bottom line
Screening is cheap; switching suppliers mid-season is expensive. Spend two weeks on the seven steps above and you will avoid the majority of sourcing failures that cost buyers real money.
Working on a custom shirt program and want a supplier that can show its line, its specs and its inspection standard? Talk to our team.