A wetsuit has a back, an access opening at the neck portion, and a closure system provided at the access opening. The closure system has an internal gasket made of a generally V-shaped piece of flexible material having an upper edge and two side edges, and a collar connected to the upper edge of the gasket. An inner flap is hingedly attached to one of the side edges of the gasket, and has an outwardly-facing surface, with at least one Velcro™ pad provided thereon. An outer flap is hingedly attached to another of the side edges of the gasket, and has an inwardly-facing surface, with at least one Velcro™ pad provided thereon.