A brassiere according to the present invention is provided with a pair of cover cloths, a strap attached to the upper parts of the both of cover cloths, and an under bust belt to which lower hems of the cover cloths are attached. The lower hems of the cover cloths are disposed to the under bust belt so as to be slidable right and left so that a user can breast-feed a baby by sliding one of the cover cloths along the under bust belt to expose either of her breast from the side hem of the cover cloth.