Leather Combination Jackets Leather combination jackets are perfect for sporty bikers. Together with the right leather trousers, they make an outfit that offers maximum protection. A close-fitting cut is particularly important so that there is no flapping at high speed and to ensure that the protectors are correctly positioned. When buying a leather combination jacket, you should therefore check for a good fit. Leather is a natural material. It shapes itself to your body, and stretches a little with time. 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.