How do your friends identify you among the crowd?

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Just a week ago, me and my friends went out to meet at a certain mall. Unfortunately with my phone broken, I couldn't contact them but not too long they arrived. I was really surprised on how they could have found out it was me since I was in the middle of a crowd searching for them. That was when they said that there were two points they had looked at which were my fashion of dress and what I usually do. One thing was that I usually wear black clothes with an earphone on one ear and was usually the only guy with both arms accessorized while on the other hand, I was always standing when waiting. It kinda made me laugh. I really didn't expect they knew me that much as it had already been two years since we last went out together. What about you guys? What makes you unique among the crowd?