Hello Girls. When we were young and daring, we were also quite oblivious that some undergarments we wore could be noticed.
I'm speaking of in my early teens, I would wear under my boy clothes pastel panties, matching Panty girdle, &
matching Bra (I did buy these on my own), RHT stockings with no boy socks.
I then went out to a mall and would hope Girls would see my Garter tabs or Bra straps. It did happen on occasion.
Did this ever happen to you?