Proto sample
The first version of the garment, made from the pattern to check the design and construction. It may use substitute fabric. Comment on shape, proportions and details.
Fit sample
Made in your base size, ideally in the correct or similar fabric, and tried on a fit model or form. Fit comments are made against measurements so they can be applied to the pattern. There may be more than one fit round.
Size set
One piece in each size, to check that grading works across the range. This is where placement of prints and embroidery across sizes is confirmed.
Pre-production (PP) sample
Made in the actual bulk fabric, trims and labels. Once approved, it becomes the standard the bulk order is checked against.
Top of production (TOP) sample
Pulled from the first pieces off the production line and sent for your confirmation that bulk matches the approved PP sample.