home made halloween costume ideas! plz not too diffucult!?

im 12 and it cant be childish like a pirate or anything like tht. and be creative and original!

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HOME MADE HALLOWEEN COSTUME : SEXY NERD. HELP!?!? EASY 10 POINTS?

ok so for halloween im going to be a nerd but im making my costume from home. Im wearing the following for my costume:
- store bout denim mini skirt with rips and holes in it and frayed at the bottom
- black and grey plaid shirt from tilly’s that is button down and im tucking it into the skirt but not buttoning it at the top for some cleavage
- white nee high socks
- probably some kind of suspenders
- black flats
- nerdy glasses w/ tape
- i recently got my hair cut so my hair is short (shoulder length) so im straightening it and leaving it down
- me and my friend are buying spray temorary hair dye frum a halloween store so probably like a purple or red streak in my hair.

so i wos wondering if any of you had maybe anything to add to that or and more ideas?? also, how should i do my makeup (im 14 so nothing horrible but remember SEXY nerd) me and 2 friends are going with a few guy friends but we like them and they kinda like us so we wanna look good. so what should my makeup be?? please describe in detail! thanks in advance!