I hate to throw cold water on your dream but I think anyone who rides a bike in less than long pants, long sleeved shirt and helmet is being very foolish. Road rash doesn't bow to fashion and a kilt is a very good way to have rash on parts of your body that don't heal very fast and are very tender. As has been suggested either put on pants under the kilt when you mount the bike or leave the kilt off until you have arrived. Just use some common sense. No insults intended just concern for your health.