Proto, Fit, Size Set, PP Sample: What Each Is For

A knitwear style usually passes four sample stages: proto, fit sample, size set and PP sample. Each one fixes a different thing, and each is signed by a different person. A proto proves the style can be built, a fit sample proves it wears correctly, a size set proves every size in the run is graded, and the PP sample is the piece bulk is matched against.

What are the four sample stages, and what does each one decide?

They run in a fixed order because each stage needs the one before it settled. A proto answers questions that would otherwise waste bulk fabric; a size set asks questions that only exist once the fit is fixed. The table is the whole sequence in one view.

Stage	What it decides	What it is made from	Skipping it costs
Proto	Whether the style can be cut and sewn as drawn, and whether the proportions read	Closest available fabric, any colour, no decoration or a stand-in	A construction or proportion problem found after tooling and grading are paid for
Fit sample	Balance, armhole depth, sleeve pitch and body length on a real body	The intended fabric, one base size	Fit corrections arriving after grading, so every size repeats the fault
Size set	Whether the grade holds from the smallest size to the largest	Bulk fabric, one garment per size	End sizes that do not fit, discovered with the fabric already cut
PP sample	Whether the approved style can be reproduced in production, and what bulk is judged against	Bulk fabric, bulk trims, bulk labels, production decoration	No physical reference, so bulk is compared with a drawing or a memory

What does a proto sample decide that nothing later can?

A proto exists to answer three questions: can this be cut and sewn at the construction you asked for, do the proportions read the way the drawing suggests, and does the decoration land where you think it does. Rough is acceptable here. A proto is often made from whatever the mill has in a weight close to your target — hoodie fabric alone runs 240–550 GSM — in a colour nobody will sell, and judging shade here wastes a stage.

What gets signed is the construction route and the block, not the garment. Your product developer and the pattern maker sign it, and the note records which seams, which collar build and which decoration method carry forward into the next stage. The cutting and sewing page shows which seam belongs on which panel. If the seam list is still open at this point, the fit sample will be made twice.

What is a fit sample for, and why only one size?

A fit sample is made in the fabric you intend to sell and in one size, the size that will carry most of the order. One body and one size are agreed before cutting, because a garment tried on three people produces three verdicts and no decision. Fashion sketches hide armhole depth; a worn garment does not.

Fit is signed by the wearer or fit model together with your technical designer, and the signature covers balance, armhole, sleeve pitch, body length and how the hem sits; a 2 cm error at the armhole moves every size above it. The measurements taken here become the base for grading, which is why a fit change after the size set returns the style to this stage instead of being edited into a spreadsheet.

Why is a size set the stage buyers skip?

A size set is one garment per size, cut from the graded pattern and measured flat at every point on the chart. In a run of 5 sizes that is 5 garments to measure, where the fit sample gave you one. It answers the question a single sample cannot: does the grade hold at the ends of the run, or does the pattern only work in the middle? A base size that fits beautifully says nothing about the size two steps above it.

This is the stage most often dropped when a calendar tightens, and the one that costs most when it is. A grade error is not one garment out of tolerance; it is the same error repeated across every unit in three or four sizes. Two facts settle the argument: patterns fail at the ends of a run, not in the middle, and recutting panels costs more than the 3–7 working days a size set takes. How a 100-piece order runs shows how little room a short run leaves for that mistake.

What makes a PP sample the one that gets sealed?

The PP sample is the first piece made with bulk fabric, bulk trims, bulk labels and the production decoration, on the setup that will run the order. It is not a design sample. It answers whether the approved style can be reproduced at production speed, under 100% inspection, and it is the object the bulk run is judged against.

The signature attaches to the garment rather than to an email: the approved piece is sealed, labelled with style, size, colour and date, and held as the reference for the run. On an order of 100 pcs per style, per colour, that one garment stands for every unit produced, so it is the last place to accept a compromise.

When does a change mean a new sample rather than an amendment?

Four kinds of change send a style back a stage. A pattern or grade change returns it to the fit sample, and then to a fresh size set, at 3–7 working days each. A change of fibre composition or fabric weight returns it to the proto, because drape, shrinkage and hand feel move with the cloth. A change to collar, placket, pocket or seam structure returns it to fit. A change of decoration method, size or placement returns it to whichever stage fixed the decoration, usually the PP.

The rule behind all four is the same: each stage tests one set of variables. A change made on the PP sample is a change made with no stage left to test it, and the first place it appears is the bulk inspection. Amendments suit labels, hangtags and carton marks, which are not part of the garment; they do not suit anything that alters the piece.

How do the stages add up on the calendar?

3–7 working days is the time to produce one sample, counted from a confirmed spec and colour reference. It is not the total for the sequence. Four stages, each followed by your own review days, push the start of bulk out by weeks, so the figure to plan against is the whole chain and not the sample lead time on its own.

Bulk stays 15–25 days after sample approval and deposit, whichever stage you finished on. The way to shorten a project is therefore fewer avoidable stages, not a shorter bulk window: signing a fit sample in 3 days instead of 10 days saves more than pressing for a faster size set. The lead time calculator runs the chain with your review days included, and the production timeline shows what happens inside the bulk window.

How do you sign a stage without signing “approved”?

Approved on its own tells nobody what was checked. A signature should name the attribute set it covers: approved for fit and grade, shade pending; approved for construction, decoration pending. Each stage has a short list, and the list belongs in the approval record rather than in a chat thread.

Written this way, a later disagreement is a comparison against a named list. It also blocks the common drift, where a signature given for fit is later read as approval of shade, trim and packing. The knitwear tech pack template has the approval record fields, and the ten-point sample approval checklist covers what to measure once a sample is in hand.

What do buyers ask most about sample stages?

Do we need all four stages on every style?

Not always, but keep the two in the middle. A proto and a fit sample can be combined when the style repeats a block you already run, which saves one round of shipping and comments. A size set and a PP sample should not be skipped on a first order, because one proves the grade across the run and the other is the piece bulk is signed against.

Can one sample cover two stages?

Sometimes. A combined proto and fit sample works when the block is known and the fabric is settled. It cannot also cover the size set, which needs the graded pattern and one garment per size, and it cannot cover the PP unless it is made from bulk fabric, bulk trims and production decoration. Combining too much makes the signature ambiguous.

Is a size set really necessary on a small order?

Yes, and a small order leaves less room for a wrong size, because there is no spare stock in another size to cover it. At 100 pcs per style, per colour, a grade that fails at the two end sizes removes those units from sellable stock. The size set takes days; the rework takes fabric and a slot in the line.

How long does one stage take?

3–7 working days from a confirmed spec, which covers cutting, sewing and the first decoration application. That figure does not include your own review days, so plan the calendar against the whole chain rather than one sample. Four stages with reviews push the bulk start out by weeks rather than days.

If we change one detail, does everything restart?

Only the stages the change touches. A label position, a hangtag or a carton mark can be handled by written amendment, because the garment does not change. A fabric, pattern, collar or decoration change restarts at the stage that fixed it, and every later stage has to be repeated because it was approved on the earlier version.

Is the sample charge refundable?

The charge covers the work on the sample and is quoted in writing before it starts. It is credited against the bulk invoice once a single style reaches 300 pieces, and it is not returned when a style is dropped after the sample. Ask for the written figure with the quotation rather than after the sample ships.

Send the tech pack, the size range and the date you need goods in hand, and the reply will name the stages your style actually needs and the days each one takes. The contact page reaches the sampling desk directly, and the RFQ fields list what to include, from runs of 100 pcs upward, so the first answer is a quotation.