That we use our apparel to protect us from the harsher aspects of the elements is a given. We understand that as one of the root reasons we wear clothing at all. The other easily apparent reason is our seeming need to codify, and place each other, and ourselves, into a hierarchy of one kind or another.
But, there is another reason we do this; a less often spoken one, and a murkier, less understood one. We wear clothing, in part, as psychological protection from each other. We gird ourselves to keep away the dangers of too much intimacy, to keep out the unkind, and the uncaring. We strap on, sometimes literally, layers of garments to insure that we don't give someone else the upper hand, by revealing too many truths about ourselves.