Flannel Nightshirts

nightshirts
A long, loose shirt worn to bed
(nightshirt) nightclothes worn by men
A nightshirt is a garment intended for sleeping in. It is somewhat longer than most regular shirts, reaching at least down to the thighs, but usually shorter than a dress or robe, leaving some of the legs uncovered.

flannel
washcloth: bath linen consisting of a piece of cloth used to wash the face and body
(usually in the plural) trousers made of flannel or gabardine or tweed or white cloth
Men's trousers made of such material
A washcloth
A kind of soft-woven fabric, typically made of wool or cotton and slightly milled and raised
a soft light woolen fabric; used for clothing