Should a girl wear leggings with a thong for school?

Anonymous
My younger sister who's 14 (almost 15) has a free dress day coming up and she was going to wear leggings. But to avoid a VPL or see-through she was going to wear a thong. But, would people be able to tell that she' wearing a thong - if so, for guys, turn on or turn off? for girls - is this too slutty? PLEASE HELP ITS ON Friday X
Should a girl wear leggings with a thong for school?
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