Is it normal for boys but not girls to go around the house in underwear?
As a young boy, I was often in just my underwear (multiple pairs of tighty whities, which I wore like a diaper for frequent poop accidents, but that's another story) while my two older sisters never did this. My sisters always had pants on during the day and at night they always wore pajamas. Several hours before bedtime and in the morning after, I'd have on underwear and a shirt (which of course, was also what I wore to bed), and on weekends and during the summer I'd remain in my underwear for much of the day unless I left the house. My sisters made a big deal about the fact that they never let me see them in their underwear, because only boys did this sort of thing, according to them. In other households I visited I also noticed that boys would often be in underwear or diapers, but girls would always have pants, shorts or pajamas on some kind on.