When I was very young I thought that underpants were worn only under pants. When I wore skirts I wouldn't wear anything beneath them, not having any underskirts. It took a windy day for my mother to catch on. We called them underclothes after that.
A childhood belief about appearance

others believed things like this
- i used 2 think if u lied your pants would catch on fire cus of the sayin "lier lier pants on fire!"— nell
- when I was young I used to believe if I squinted my eyes and it was windy my eyes would stay like this forever— Jeanne
- One kid I know believed that because I wear glasses, it wouldn't hurt if he poked my eye.Anon
- I wouldn't wear stripy socks because I used to believe the stripes dug into your feet— Shirley Reeves
- I used to believe my middle name was spelled "Worn" it is "Warren"— Bart
- I used to belief that the Muslim women who wore their garment wore it because they were bald.Anon