Enter: the knit polo shirt. The polished, lightweight layer can be worn on its own or thrown over a T-shirt for extra warmth without adding bulk. The preppy-coded style, long associated with academics ...

Lacoste’s signature design still features its telltale short button placket, elegant collar, and ribbed sleeves ... extra oomph, a knit polo cut from a hardy-but-soft wool—or even an extremely ...