Abstract: A buckle for use with t-shirts, hair or other similar flexible substrates. The buckle is comprised of a base portion having openings through which the tail of the t-shirt is inserted and a cover which removably locks onto the base, thereby securing the buckle to the t-shirt. The base is provided with two openings separated by a bar and surrounded by an inwardly facing ridge. The ridge is engagable with a series of outwardly facing grooves provided on the cover in order to releasably lock the buckle to t-shirts of various thicknesses.