Off to Ecosystem's Unlimited
Why did you choose clothing first?
If humans ever decide to modify themselves to live in space without suits, they may not look human, but will probably still want pockets.
So, given that you can't use size, shape, or even D.N.A. as being one hundred percent accurate, how would you define human?
I'm passing you, because it's a lot easier to pass you than to answer your question.