FF wrote;

"You ask why nothing else wears clothes - why should they?"

Exactly...

Added to which... the wearing of clothes is a cultural adaptation and has NOTHING to do with evolution. We are all born naked, and indeed many primitive tribes wore no clothing, particularly in hot climtes, until recently. Covering nakedness was always a priority of missionaries. So why did they cover up? The answer is very off-topic... but interesting, if unscientific.