A clamp that attached to fabrics is provided that includes a tubular member and a locking member. The tubular member has an elongated tubular shape with a lengthwise slot disposed therein between a first end and a second end longitudinally opposite the first end, and a protrusion that extends out of an inner surface of a lengthwise cavity within the tubular member. The protrusion is disposed within the tubular member biased toward one side of the slot to create an asymmetrical cross section in the tubular member. The locking member has thickness smaller than a width in the slot and a width greater than the width in the slot allowing the locking member to be inserted into and out of the slot in a first orientation but not in at least one other orientation.