Kickers/Punters/LS - Outerwear, hats and rainwear. You never know when you'll need them but they need to be reliable and ready to go when you do.
Running backs & Wide receivers - shoes. No way you get anywhere without them. The better they are, the further you can go.
Special Teams - Toiletries. No matter what you think, you just can't live without them.
Offensive Line - the undergarments. The foundation for everything else. One false move and everything else falls apart.
QB - Socks. Good ones will last a lot longer than bad ones. Best when they go well with the shoes.
DBs - Tops: YOu can never have too many good ones and they help offer different looks