Things may go in and out of fashion, trends may come and go, but a smile is a style that will go a long mile. (Yes, rhyme fully intended.)
Don't forget that no matter what you wear, where you go, how you behave, with whom you speak, the one thing that will stay constant is your positivity. Never underestimate the impression your happiness will make on others so never fear to spread some cheer. (Wow, we're really exhausting our poetic skills today, aren't we?)
So as cliché as it sounds, don't worry and be happy. There's nothing else you'd rather be.