One-Piece Motorcycle Rainsuits One-piece rainsuits definitely give optimal protection for bikers when the heavens open. They may take a little practice to put on, but when you buy a one-piece rainsuit from Louis you can be certain that it will give you maximum functionality and comfort. Tip: When you try on a suit, check that the legs are also long enough in the sitting position on your motorbike. If you're in any doubt, you can order two different sizes from Louis online and try them out. Louis will take back any item that does not fit or which you do not like.