The first time I did this I did it at the behest of friends for DragonCon2007. The 2nd time (TimeGate2012) was because I genuinely liked her and her official coat went on sale.
The rest is all my own clothing. Found a pink tank top at goodwill that I took in cause it was HUGE. Found earrings and necklace in my things that look just like hers. Put up my hair and slathered on way more eyeliner than I would ever wear in real life and I was done.