I'm doing a cosplay!

Twilight sparkle : try to do a nerd/ bookworm outfit. Like get a sweater vest and dye it twilight Purple then a white 领, 衣领 衬衫 also plad 短裙, 裙子 would go well.
Flutter shy: I've seen great Flutter shys with green airy dresses that incorporate alot of nature, also if she caried a basket with a plushie of 天使 that would be great.
彩虹 dash :she needs like a light blue warm up suit that 你 can add her cutie mark to, 或者 something really sporty.
苹果 jack: she just needs a form fitting flannel 衬衫 with a complimenting t-shirt under it and jeans with boots.
Pinkie pie: like a fun short party dress with ruffles at the bottom and of course it's all shades of pink.
Rarity: an elegant ball 袍, 礼服 would be great that is white with long gloves and maby a jewel 项链
苹果 bloom: try to get cute overalls and try to keep with the 苹果 jack concept
Sweetie belle: maby like a white sun dress and 公寓, 单位
Scootaloo: like 彩虹 dash very sporty maby knee pads and a raged old t-shirt, and jeans.

Try the costumer. Com for the wigs they might have the style 你 need. The hope this helps