This invention relates to a fastener (100, 400, 700, 1000, 1300) for clothing or lingerie. The fastener comprises a front element (200, 500, 800, 1100, 1400) having at least one seat cavity (201) and a back element (300, 600, 900, 1200, 1500) having at least one bump (301) for location in the seat cavity. The front element and back element each comprise magnets (235, 329) to assist in the location of the bump in the seat cavity. The front and back elements additionally comprise a plurality of complementary catch faces (203, 205, 211, 213, 501, 303, 305, 311, 313, 601) which secure the engagement of the front and back elements and are operable to prevent inadvertent release of the back element from the front element when the back element is subjected to forces in any of a plurality of disparate directions.