If you purchase leather biker apparel that is too large, you can easily shrink it down to size. It is best if you take the leather item into a shop to have it done professionally, but you can also try to do it yourself if you would like. Put enough water in the tub for you to soak the item in and let it sit for a few minutes. Use your hairdryer to help the leather dry faster and shrink. The hotter the air is, the more it will shrink. Use a leather conditioner when you are done to keep it in good condition. The Thrifty Fun website had many users give their opinion on the matter, each having a similar method for shrinking leather.