A button for clothing, comprising a metallic dome associated with an equally metallic bell-shaped part, which contains a core and is associable with the fabric of the item of clothing by means of a nail. The core is provided with a disk-shaped portion with which an axial stem is associated; the free end of the stem has a square cross-section and is force-fitted inside the bell-shaped part, which becomes complementarily shaped by plastic deformation at least at its corners, producing an association in which mutual rotation of the parts is prevented. The stem is provided with a blind axial channel for the engagement of the nail and the front surface of its end is provided with first raised portions adapted to engage the fabric and to cooperate with second raised portions that extend from the facing surface of the head of the nail.