Yeah it's not necessary, but I just love being warm. It's like a habit, winter coat, then snow pants, then out I go. Yes I'm an adult, no it's not snowing outside lol
Honestly? Yeah, it's pretty normal. My gf does it all the time.
This YT vid might shed a bit of light on the issue.
https://www.youtube.com/watch?v=9U5FETNq_nQ