An ultra-slim fastener for securing two pieces (207, 303, 115) together, the fastener comprising a male part (200, 300) mounted on the first piece (207, 303) and a female part mounted on the second piece; wherein: the male part (200, 300) is of the type comprising a substantially planar body having at its outermost end, a downwardly depending leg terminating in an outwardly projecting foot extending substantially parallel to the plane of the body; the female part is of the type comprising a substantially planar frame defining a cavity for reception and retention of the foot, the cavity being partially roofed in towards the innermost end of the frame, thereby defining an open mouth towards the outermost end of the frame; the foot, cavity and the open mouth being dimensioned so that insertion of the foot into the cavity must be realized by inclining the body of the male part relative to the frame of the female part before bringing the male part and the female part together, retention of the foot in the cavity being realized by pivoting the inserted male part from the inclined orientation to a co-planar orientation with respect to the female frame using the roof of the cavity as a fulcrum, and release of the foot from the cavity being realized by pivoting the inserted male part from the co-planar orientation back to the inclined orientation using the roof of the cavity as a fulcrum before moving the male part and the female part apart; and in which the second piece comprises a fabric strip and the frame of the female part is mounted directly onto the face of the fabric strip, characterized in that the fabric strip forms a backing for the frame and the bottom of the cavity is closed off by the fabric strip; and the second piece further comprises an overlay mounted onto the top of the frame and onto the face of the fabric strip, sandwiching the frame between the overlay and the fabric strip, the overlay having an aperture corresponding with the frame's open mouth. the male part (200, 300) is of the type comprising a substantially planar body having at its outermost end, a downwardly depending leg terminating in an outwardly projecting foot extending substantially parallel to the plane of the body; the female part is of the type comprising a substantially planar frame defining a cavity for reception and retention of the foot, the cavity being partially roofed in towards the innermost end of the frame, thereby defining an open mouth towards the outermost end of the frame; the foot, cavity and the open mouth being dimensioned so that insertion of the foot into the cavity must be realized by inclining the body of the male part relative to the frame of the female part before bringing the male part and the female part together, retention of the foot in the cavity being realized by pivoting the inserted male part from the inclined orientation to a co-planar orientation with respect to the female frame using the roof of the cavity as a fulcrum, and release of the foot from the cavity being realized by pivoting the inserted male part from the co-planar orientation back to the inclined orientation using the roof of the cavity as a fulcrum before moving the male part and the female part apart; and in which the second piece comprises a fabric strip and the frame of the female part is mounted directly onto the face of the fabric strip, characterized in that the fabric strip forms a backing for the frame and the bottom of the cavity is closed off by the fabric strip; and the second piece further comprises an overlay mounted onto the top of the frame and onto the face of the fabric strip, sandwiching the frame between the overlay and the fabric strip, the overlay having an aperture corresponding with the frame's open mouth.