Swimsuits are provided which include an outer shell made of a flexible stretchable fabric, a thoracic reinforced region arranged in an anterior thoracic region of a trunk portion of the swimsuit and having an anterior-downward converging shape, and an abdominal reinforced region arranged in a lower abdominal and hip region of the trunk portion and having an anterior-upward converging shape, two non-reinforced waist regions arranged in opposite lateral waist regions of the trunk portion and having both a medially converging shape, wherein the thoracic reinforced region, the abdominal reinforced region and the non-reinforced waist regions border in an X pattern in an anterior region of the trunk portion. Methods of making such swimsuits are also provided.