A brassiere having at least one breast supporting cup where at least one breast-supporting cup has a frontal opening to expose the breast is disclosed. The breast-supporting cup includes a panel/flap that covers the opening and a part of which is releasably attachable to the shoulder strap of the brassiere when closing the opening so that on release the opening may be uncovered. The panel/flap is releasably attachable to the shoulder strap by a clasp on the shoulder strap that is movable up and down the shoulder strap to a selected position and has a clamping part so that it may be clamped at the selected position, thereby providing adjustment of the breast-supporting cup. The clasp incorporates a co-operative engagement device thereon for the releasable attachment of the panel/flap.