Years ago, I was told that it was "traditional" in TKD to not roll the sleeves on your dobok during class. Since then I've seen plenty of Korean & American masters & GM's roll their sleeves. I'm guessing it was just the preference of my master at the time.
What things were you told were traditional that you later found out were just your instructor's (or someone else's) preference?
What things were you told were traditional that you later found out were just your instructor's (or someone else's) preference?