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Dress as "Blank Space" Taylor if you have a ModCloth wardrobe.
It's just a matter of deciding to go with the high waisted shorts and crop top or a vintage dress.
Dress as "Our Song" Taylor if you want to get another year out of your Cinderella costume.
Rip the arms off that sucker, slap on several layers of clear lip gloss, and you're good to go.
Dress as "We Are Never Ever Getting Back Together" Taylor for a unique group costume.
As the organizer of said group costume, you get to wear fuzzy pajamas while your friends wear full-on animal suits.
Dress as "Shake It Off" Taylor if you're up for a mid-party costume change.
Show up to the shindig in a leotard, leave in jean cutoffs. It's a move that will be talked about through next Halloween.