Sizing and fit data
A uniform programme needs two things from sizing: a size run wide enough that most people find something close, and a measurement that is not just height and chest but describes the garment. The second is the one that decides whether the fit works, because a shirt graded to a European size chart behaves differently across different cuts, and a polo cut for one brand sits differently on the same nominal size from another. The practical minimum is a size set of roughly six to eight graded sizes rather than three, plus a measured example — a physical sample of the actual specified garment — that staff try against before the run is committed. Skipping the sample is how a rollout ends up with an issue-return process nobody anticipated.