the world > textiles and clothing > clothing > types or styles of clothing > [adjective] > of specific size (3)
Larger than average, exceptionally large; esp. (of an item of clothing) larger than the standard or stock sizes.
women('s size) (WX, extra-large women's size).
Originally and chiefly U.S. Designating a garment size designed for stout or overweight men; (also) designating a garment of this size. Cf. sense B.