Abstract: A swim suit designed for competitive racing is made of knit mesh fabric of hydrophobic synthetic stretch yarn knitted in a small atlas type of pattern having a multitude of openings therein. The yarn is within the range of 40% to 100% denier so that the openings comprises in the range of 40% to 60% of the fabric, whereupon the entire suit has flow-through characteristics, that is, water and air pass freely through the openings in the mesh, thereby avoiding entrapment of water and/or air, with resultant avoidance of billowing and bubbling while being sufficiently opaque to conceal the underlying body of the wearer. Both men's and women's suits are provided and each includes a liner portion formed of the same fabric as the swim suit.