Is This Appropriate For Middle School?

ok, so i got a new magic trick, im a 13 year old magician. I go to a middle-school, and i was wondering if this would be appropriate.
ok so i have to silks, and i tie them together. i ask someone to put the knot down their collar, and i pull them out and a bra is tied between them.
here is the link to demo, its at bottom.

http://www.magicgeek.com/baffling-bra-305.html

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