Avery Amira had stayed in her home country she would have succeeded without a belt just like all the others. Why not?
You are right, but I believe that exist 2 main factors:
In one hand, in her country she will remain totally segregated, and reduced to home life. Even in more liberal muslim environment, this works this way.
Secondly, I believe most of girls, muslim or not, would touch theirselves if do not wear a belt.
Girls like you or @Jen are a step above us by virtue.
I think I am not a slut, but I appreciate that my belt is there so I don't have to check it.