What clothes will look good on me?

I am 5'7 and 108 pounds. Age 14 years. I have jet black hair and slightly tan skin. I'm going shopping with a friends next week and would like to get some clothes for summer. People tell me I would look good in a romper, because I'm a little tall, but I was wondering if anyone else has any suggestions because usually when I go shopping I cant seem to find the right type of clothes for myself that would look good on my body type. All and any answers appreciated! :)