Questions: Fashion & Beauty

So my girlfriend and I are going to a big pajama bon fire party that her work is throwing (I know weird don't ask). So she bought us these matching onesies. She got the thickest, and most fuzzy onesie she could fine because its going to be cold outside. It turns out that we are going to be inside for the first hour or two while we eat and do awards.
So I try wearing the onesie inside and I am sweating with clothes under it within the first 10 minutes. So I try it with just a tee and underwear and I am still to hot. So my girlfriend told me to just be naked under it that's what she's doing. I tell her that's crazy going in public naked under a onesie. But she claims that its how everyone wears them because its comfy with them being soft and fuzzy inside.
I asked her what happens if you need to take off the onesie. She just said it will be fine and people go out to clubs all the time naked inside a onesie. I mean it is really comfy like this but I think it crazy to go out in public like that in case you have to take it off. also especially since its a party for her work.

Do you think this is normal.