No, I don't. They stay warm without them, sleeping under my 2 blankets in our heated room. Plus, I am sure they are much comfortable sleeping without them. They never wear clothes when I am not watching them. If I leave them at home for the day, or anything I don't have them wear clothes. You never know what can happen, I have heard stories of clothes getting caught on stuff and them being stuck and stuff. It's just not necessary..
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