gender
also called department
The gender of body an apparel item is cut and graded for (male, female, unisex) — half of the intended-wearer DEPARTMENT every garment is sold under, read together with age_group (a men's tee = male + adult, a boys' tee = male + kids). It is an IDENTITY discriminator, not a buyable facet: the same design in a men's cut and a women's cut is TWO distinct products with different fit/grading blocks and SKUs, never one product split across a buy-box department toggle. Grouped in the `identity` concern, so by the derived-axis rule it is NOT axis-eligible — a seller never offers a single product across genders as buy-box versions. Distinct from `fit` (close-to-body cut within one gender) and from `size_type` (petite/plus/maternity, a future grading facet).