My pal was a youth team goalie at Aberdeen. Adored Jim Leighton even though he hadn't grown up supporting Aberdeen himself. Had grown his hair long and been wearing a hairband to train for a a week or so with no issue. Leighton asked to see him in the boot room and went mental. Demanded he gets rid of that before the next days session. My pal then went to get a short back and sides straight from training and all was well the next day, never spoke of it again.
My mate was released at the end of that season and didn't lose any respect for Jim until seeing David Preece playing with long hair and a hair band the next season.