What do you wear with my knee high convers for kids?

Shorty shorts and a shirt that matches it!
You can also wear a pair of skinny jeans and zip up the shoes over them.
Don't wear any "seriously punk-rock" clothes with them, unless you usually wear them.
I know a girl who wore black skinnies, a studded belt, a black shirt, and a black hat with those shoes. Everyone thought it was weird because she usually wore pink and cute stuff.

Also, wear a pair of knee-high socks. I usually pull them up higher than the shoes, so you can see them.

Hope I helped! [: