A thin garment closure includes a male member with a bar having a ball each end and a female member having a trough shaped to receive the bar. The bar is positionable in the trough when the male and female members are in a substantially transverse orientation, and when one member is rotated so that both members are substantially coplanar the closure is closed. The male member has side arms angled inward and connecting the male exterior side and the bar. The length of the bar is shorter than the length of the male exterior side. The trough of the female member has a concave region to receive each ball of the bar. In an embodiment, the concave region is enlarged toward the center of the closure to accommodate movement of the bar under tension. These features improve the tensile strength of the closure.