A quick question, and I don't want it to sound creepy or anything.
I make cosplay costumes, with wigs and everything by hand. I usually get commissioned to make them by cosplayers.
But for quite some time I wanted to make an accurate Gura cosplay. However, there's just no models that have the good body type for it.

The question is - how do I - legally, without getting into any trouble - get a girl of good body proportions and age to work with me? I guess I'd need her parents' permission, but how do I even start? I don't want to be a creep or anything.