I don't remember who it was but they attempted to answer that same question for me.
They explained that Adam and Eve were perfect and since we are not instantly perfect after Armageddon we would still need clothes. It wouldn't be untill we became perfect people that the feeling of shame would be gone and the need to clothe ourselves for that reason would be gone as well. However, since we don't clothe ourselves just out of shame there would be other reasons for clothes. The weather would have us cover ourselves for protection. We will be perfect..not stupid.
But that is just one persons opinion.