Soror Ideal08,
I have always found that somethings can not be presented in a sensitive manner. Sometimes you just have to say it. People may not like me for my directness but they sure will respect me, ok?
Besides, you want this young girl to respect what you are saying so that she can learn to respect herself and her body. Tell her the do's and don'ts of what women are suppose to look like especially in public

I dred to see what the mother looks like. Anywho, let her know that her body needs to breathe and not stuffed like a pig in a blanket. Oh my. Did I say that?