My 2.5 y.o. likes to take off his clothes and/or diaper, too. We have constant conversations about what his choice is. "If you don't want to wear your diaper, you have to use your potty. Which do you want to do?" Mostly he picks to wear the diaper, sometimes he uses his potty. I personally understand how confining wearing clothes is, and hate to sleep in anything. So, when my kid ditches all of his clothes, I get it. It drives my husband crazy, and he always asks, "Why is he naked?" I finally got tired of having the conversation so I just answer, "because he took his clothes off." LOL. He is a very analytical person, and this cause effect answer drives him crazy. So, now he either doesn't ask or works harder to get an answer closer to why he is asking in the first place. Anyway, the baby and I make a deal. I tell him that he can keep his clothes off for a little while. I usually give him about 30 minutes. Then I dress him again. Usually he will stay clothed if I give him a little breathing time to feel loose and fancy free. If he uses his potty properly during that time, he gets applause. I'm not big on rewarding stuff, but he gets lots of smiles, attention, applause. For what it's worth, see what two choices you can give her that you can live with.