I have read some past threads looking for this answer, but no luck! My DS is a USMA hopeful, and I am thinking of Christmas gifts for him (which he can also wear for Plan B if the need arises!). I am looking at Under Armour long underwear pants and shirts. Do they need to be a specific color? Also, for boot socks, should they be black, or is there another color that is required? Thanks so much!