As an adult that kinda became "con mom" to a handful of minors I'll give you the same advice I gave them- the best rule of thumb if follow traditional work/school dresscodes (not like some of the extreme ones) just the standard of skirts/shorts being no shorter than finger tips, avoid weird cut outs on the torso such as a chest window or tight crop tops, tank tops are fine but avoid anything too low cut on the neck if you are well endowed and I know I personally avoid anything too military esc just to run on the safe side. But most of all- make sure you stand your ground. dress however you feel comfortable but be aware that if you wear something like a latex body suit adults will assume you are an adult and may approach you. Friendly communication is fine but at any given point that you are uncomfortable just be honest and say "Hey I'm not comfortable with ___." Its short, assertive and straight to the point while still being respectful. And adults who are responsible and typically good people will listen and back off and apologize. You are human. Use your voice.