A protective suit has a zipper defining a pass-through opening with one end of the zipper being led over an indirect path about a region of the body which is not easily accessible by the wearer of the suit. The protective suit is improved so that for the purpose of easier opening, especially in emergency situations, the pass-through opening in the region of the indirect path can be opened by the suit wearer by a one-handed pull movement performed from a location within convenient reach and in any desirable direction suitable to the body. For this purpose, the zipper is provided with a slide on which a flexible pulling means acts which is guided along the indirect path.