A collar stay, collar stick, collar bone (British English), collar tab (British English), collar stiffener, or collar stiff is a shirt accessory consisting of a smooth strip of rigid material, rounded at one end and pointed at the other, inserted into specially made pockets on the underside of a shirt collar to stabilize the collar's points.
A collar stay, collar stick, collar bone (British English), collar tab (British English), collar stiffener, or collar stiff is a component for shirts that consists of a rigid material with one end rounded and the other pointed. This component is inserted into designated pockets on the collar underside to ensure proper alignment of the collar's points.