When I was in college I saw a (white) woman wearing a fanny pack while I was waiting in line for food at the student union. I was so surprised that I actually blurted out something to the effect of "Is she wearing a fanny pack?" loud enough for her to hear. We both laughed about it, but she was clearly embarrassed and I felt bad for pointing it out. In general I avoid bringing up people's appearance (especially for a complete stranger). I don't know what come over me that time.