Abstract: This document applies to a device (1, 8, 13, 22) to maintain in contact, to regulate, adjust or close parts of clothing, undergarments such as bras, garter belts, or any other accessory, and clothing, underclothing, more particularly bras and accessories having such a device. This device includes a first part (2, 14, 23) equipped with at least a first magnetic component (4, 11, 17, 25 30, 52), and a second part (5, 19, 27) equipped with at least a second magnetic component (6, 12, 18, 25, 30) making it possible to fasten, regulate, adjust or close clothing, undergarments or the accessory when one of the aforesaid first and second parts is used to interact with the other part. Each magnetic component is composed of at least two groups each one comprising at least a positive magnet (4?, 6?; 11?, 12?; 17?, 17??; 18?; 25?; 30?) and a negative magnet (4?, 6?; 11?, 12?; 17?, 18? 18?, 18??; 25?, 30?).