Sew the tail edge of trousers with thread. The swimsuit material is relatively thin, especially the boxer swimsuit. When swimming, the tail edge of trousers is easy to roll up, so you can sew the tail edge with thread to reinforce it. Swimsuit refers to women's special clothing when swimming, and there are also men's swimwear. Swimming suits are different from gymnastics suits. Generally, bathing suits will not sink when immersed in water. Swimsuits are generally made of textiles that don't sag or swell when exposed to water.