I make every one of these mistakes.....shame on me...lol
Wearing jeans that give you a muffin top.It's not your fault! Do you remember how popular low rise jeans were? No one was able to find a pair that fit. Maybe there were two people, but they were almost certainly movie stars, and they have their own problems.
Wearing clothing that is too loose. Not everyone goes too tight, but everyone is ashamed of their imaginary fat at some point and opts for things that are too loose.
Dressing like a child. Not knowing quite how to dress like a grown-up when you go to your first job and realizing you really shouldn't wear hair bows, even though you've been doing it FOREVER.
Going orange. Sun-less tan. Did anyone make it through high school without accidentally turning themselves into a streaky tangerine? Raise your hand. Ah. Wait. Your palms are orange.
Overexposed yourself. At some point - whether it's when you realize that your white dress is see through in bright sunlight, or that whenever you lean over your top gapes open - we've all accidentally flashed someone, right?
Wearing dated items. To be fair, if you give it a year people will just assume you're doing it ironically.