A disposable swimsuit includes a lower piece having a front covering piece and a back covering piece to define two leg openings at two outer edges of the lower piece and a waist opening at two upper edges of the front and back covering pieces. The disposable swimsuit is made of swimwear garment including an outer stretchable layer and a lining layer overlappedly attached to the outer stretchable layer in an edge to edge manner, wherein the outer stretchable layer is made of water resistant material having air ventilating ability and flexibility, wherein the lining layer is made of non-irritant and air ventilating material.