Nightshirt :: Nightshirt (n.) A kind of nightgown for men.
Shirt :: Shirt (n.) A loose under-garment for the upper part of the body, made of cotton, linen, or other material; -- formerly used of the under-garment of either sex, now commonly restricted to that worn by men and boys..
Shirt :: Shirt (v. t. & i.) To cover or clothe with a shirt, or as with a shirt..