What we do during nap time

Kate has learned to take off her clothes and after her afternoon nap, I usually find them on the floor outside her crib. Luckily she had a onesie on and she hasn't learned how to undo snaps. Last time we took our pants off, the diaper came off as well. It was a mess.

Pictures below:
#1- Kate in onesie.
#2- Kate's dress on floor.
#3-View of the dress removal.

Our Gigi made the dress Kate took off. Could it have been a dress malfunction???