Aspects herein are directed to a support garment having a single strap adjustment mechanism. A first end of the strap is adjustably secured to an upper margin of a first breast contacting surface, and a second end of the strap is adjustably secured to an upper margin of a second breast contacting surface. An intervening portion of the strap is configured such that as the strap extends from its first end, it crosses diagonally downward to a first aperture located on a wing portion of the support garment through which it passes. It then crosses horizontally to pass through a second aperture located on another wing portion of the support garment. It then crosses diagonally upward where it terminates at its second end.