In order to appear confidant to others you need to be confident with yourself. I totally agree with some of the other comments, wear and do what makes you feel the best, you need to try really hard to disregard what others think and that can be the main issue for many self confidence issues, but i watched a video the other day, a girl was talking about confidence and highschool and she said something along the lines of, "in order to be the shit, you need to act like the shit. but not a total little shit, you still need to be kind and stuff." even though it kind of sounds wrong, its the right idea. ive found with personal experience that if you forget about the insecurities you see when you look in the mirror and the whispers that other people might say and just think to yourself, that you are beautiful and pretty and amazing, and you just keep thinking that while you walk arounnd with your head held high others will start to believe its true too. confidence is contagious, and if you are confidant literally nothing can stop you.