Nakey Days

My two youngest kids love to wear nothing but a diaper/underwear. I don't really get it. I would be freezing, yet they can don this attire in the dead of winter and be perfectly fine. Their little toes and fingers will send shivers down my spine if they happen to touch me but they don't seem to mind. I think it would be wonderful to feel comfortable all the time, even in the buff. I'm either cold or hot. Rarely in between. It's probably a hormonal thing. Ugh.

So, is this a normal kid thing? Or are mine just weird?