1. Do not stretch in the locker room. There is an entire gym full of mats and other professionally designed stretching devices for your stretching pleasure. You do not need to sit on the floor of the dirty old locker room to stretch. You especially do not need to do toe touches or deep knee bends in the locker room.
2. If you choose to ignore the previous rule and go ahead and stretch in the locker room, and especially if you are doing toe touches or deep knee bends, please for the love of god wear some pants.
(Frankly people, I feel a little violated.)