Check out this item in my Etsy shop https://www.etsy.com/listing/223298012/new-rarity-my-little-pony-top-skirts
White unicorn horn on purple headband with purple and blue felt flowers - Rarity costume
Rarity Felt Cutie Mark Rarity costume DIY Rarity by BloomsNBugs, $5.00
Unicorn costume wig - unicorn cosplay / horn / last unicorn costume / amalthea costume. $130.00, via Etsy.
Rarity costume cosplay wig - Curly purple wig / my little pony costume / unicorn / friendship is magic. $115.00, via Etsy.
A Bejeweled Pony by *EclecticManiac on deviantART - Rarity from My Little Pony: Friendship si Magic
my little pony costume rarity - Google Search
The Lovely Side: My Little Pony | 6 Magical Costumes Ideas for Halloween
Love everything about this one...but especially the lips.