Buyer guide
Development, fit, pre-production and sealed samples answer different questions. Confusing them is the most common reason a program arrives late.
In short
An apparel program normally runs through four sample types. The development sample proves the style can be made. The fit sample proves the pattern. The pre-production sample proves the bulk materials and the actual production line. The sealed sample is the signed reference the bulk is judged against. Each answers a question the previous one could not, which is why skipping a stage does not save time — it moves the discovery later, where correction costs more.
7 min read
Reviewed by AHM International product development team
Last reviewed August 2026
Why there is more than one sample
A common buyer instinct is to treat sampling as repetition: the factory keeps making the garment until it is right. That reading makes every round feel like a failure, and it makes cutting rounds look like an obvious saving.
It is not repetition. Each sample type isolates a different variable, and it does so deliberately, because testing several variables at once makes a failure impossible to attribute. If a first sample is made on bulk fabric with final trims and it comes back wrong, nobody can say whether the pattern, the fabric or the construction caused it.
The sequence exists so that by the time an expensive input is committed, the cheap questions have already been closed.
The four stages
Each stage closes a question and opens the next.
- 01
Development sample
Proves the style can be made as drawn. Often in substitute fabric of a similar weight and construction, because the question is whether the construction works, not whether the material is final. A development sample in the wrong colour is not a defect.
- 02
Fit sample
Proves the pattern against your measurement specification. Reviewed on a form or a fit model, measured at every specified point, and returned with a variance report. This is where most revision rounds happen, and it is the cheapest place for them to happen.
- 03
Pre-production sample
Proves the bulk materials and the actual line. Made on the fabric and trims that will be used, by the operators who will make the order. A PP sample is the last point at which a change is inexpensive.
- 04
Sealed sample
The approved reference, signed by both sides and retained. Every inspection during production is judged against it. Once it is sealed, the specification is closed.
What each sample proves
The middle column is the one buyers most often assume is covered earlier than it is.
| Sample | Proves | Does not prove |
|---|---|---|
| Development | The construction is buildable | Fit, final colour, bulk behaviour |
| Fit | The pattern matches your spec | How bulk fabric will behave |
| Pre-production | Bulk materials and the line | Nothing further — this is the last gate |
| Sealed | The agreed standard for inspection | It is a reference, not a test |
How to reduce the number of rounds
Sample rounds are driven by unresolved decisions, not by factory speed. A program with tolerances, a colour standard and consolidated comments converges in fewer rounds than one without, because each sample closes a written point rather than testing an interpretation.
The single most effective change is consolidating comments. Where feedback arrives from three people over a week, the factory either waits — losing days — or starts on the first set and reworks when the rest arrive. One consolidated list, sent once, removes both failure modes.
The second is separating fit comments from styling comments. A fit comment changes the pattern; a styling comment changes the design. Mixed together, they usually produce a sample that resolves neither.
Skipping the PP sample
It is the stage most often cut for time, and the one where cutting costs the most. Its whole purpose is to prove the bulk fabric and the actual line, so skipping it means the first time anyone sees the real materials made by the real operators is when the order is already cut. A fault found there is measured in thousands of pieces.
Related questions
It depends far more on how resolved the specification is than on the factory. A complete tech pack with tolerances and a colour standard commonly converges in two to three rounds. A verbal brief with a reference photo can take five or more, because each round is discovering a decision rather than confirming one.
It is possible where a proven pattern already exists — a repeat style, or a garment being reproduced from an approved reference. For a new development it removes the cheap stages and leaves only the expensive one, so a fault surfaces after bulk fabric is committed.
Sampling terms are agreed commercially before development starts, and they vary with the number of styles, the complexity and the program size. AHM confirms them in writing at the requirement stage rather than leaving them to be discovered on an invoice.
It is retained and referenced at every inspection gate through production. When a final inspection asks whether a garment is correct, the sealed sample is the thing it is compared against — which is why both sides sign it and both sides keep one.
Send one specification and we will apply exactly this thinking to your style. Construction, materials and commercial FOB costing.