Brands new to manufacturing often ask for "a sample" without realizing that the word covers three very different stages of development, each with its own purpose, cost, and turnaround. Mixing them up is one of the most common (and avoidable) causes of delay in a first production run.
Proto sample — proving the concept
The proto sample is the first physical version of a design, usually made from substitute fabric rather than the final material. Its job is to check silhouette, construction, and general proportions — not colors, not final fabric hand-feel. Expect one to two rounds of revisions here before moving on.
Fit sample — proving the sizing
Once the concept is approved, the fit sample is cut close to (or in) the actual fabric and checked against a size specification on a real body or mannequin. This is the stage where a factory's pattern-making skill actually shows — small grading errors here are far more expensive to fix once bulk cutting starts.
Pre-production (PP) sample — proving the factory is ready
The PP sample uses the confirmed fabric, trims, and construction exactly as bulk production will. It is signed off by the brand as the reference standard the entire bulk order will be measured against during quality control. Skipping this step to save a few days is one of the most common causes of bulk-order rejections.
A simple rule of thumb
If you are validating a design, ask for a proto. If you are validating sizing, ask for a fit sample. If you are about to commit to bulk production, insist on a PP sample and sign off on it in writing before cutting starts. Treating these as interchangeable is how "the sample looked fine" turns into a bulk shipment that doesn't.