To develop a wet suit for marine sports easy to put on and take off while keeping water tightness.

Two fasteners (4), (5) holding a gapping piece (31) having a gap (3) are placed on a wet suit (1) nearly symmetrically in vertical directions. On the inner side of the gapping piece (3) on which the two fasteners (4), (5) are placed, a stretchable inner closing piece (22) forming the opening for putting on and taking off the wet suit (1) is placed by sewing it on the main body of the wet suit. On the upper part of the gapping piece (31), a closing part (32) extending into right and left directions in a nearly wing shape is formed; and on the upper edge of the gapping piece (31), a belt (7) binding to the collar part (6) and having a hook-and-loop fastener sewn on it is formed. An opening (2) is formed with the front part of the wet suit (1) and the inner closing piece (22), and a wearer can easily put his body into the clothes through the opening, the wet suit becomes easy in wearing, and water tightness can be kept, due to the two fasteners (4), (5) having a gap between themselves.