The uniform the Star Army used by the Star Army of Yamatai from YE 29 to YE 38 for physical activities consisted of a white ringer T-shirt and a bikini swimsuit bottom with the Star Army of Yamatai logo on left leg. It was worn with white socks and (if planetside) white shoes. It was replaced by the Star Army Exercise Uniform, Type 38 in YE 38.
The swimsuit is merely the exercise uniform with the shirt removed. The standard-issue black sports bra doubles as a bikini top. Males are issued black swim trunks instead of the bikini bottom.
The shirt is available: Cafepress's Star Army Store.