Menswear is clothing made for men — suits, shirts, trousers, coats — and the men’s side of a shop. You will see it on department-store signs, in fashion writing, and in industry talk: a menswear designer, a menswear collection, the menswear floor. It is built from men + a linking s + wear. Wear here means “clothes of a kind,” as in sportswear, not the verb “to wear.” The s is the old “of men” idea, but in this spelling it has fused into one word, with no apostrophe. At home people just say men’s clothes. Though actually, shop English is messy. You will also see men’s wear as two words, and that is also understood; the one-word form is shop and fashion talk. Menswear names a department and a style, not “anything a man happens to put on.” A woman can wear menswear; the word still points at that men’s-cut, men’s-section world. It is not a verb: you wear menswear; you do not “menswear” someone. The parallel shop word for women’s clothes is womenswear.