A wetsuit structure (10) having a zipper (15) extending from a neck opening (14) of the wetsuit and down that portion of the wetsuit which, in use, will at least surround the upper part of the torso (11) of a wearer of the wetsuit. A barrier panel (16) of stretchable, substantially water proof, material is attached within the interior of the wetsuit adjacent to, and underlying, at least a major portion of the length of the zipper. The wetsuit structure also has a detachable neck or collar (17) of stretchable, substantially water proof, material adapted, in use, to be pulled over the head of the wearer while stretching in the process, but then relaxing to fit relatively tightly into sealing engagement around the neck of the wearer, and a series of press studs or snaps (18, 19) to detachably connect the neck or collar to the body of the wetsuit. The neck or collar (17) may be a simple neck or collar, or be formed as part of a hood which, in use, will fit around the head of the wetsuit wearer with an opening therethrough in the facial region of the wearer.