Irene Adler - Sherlock
I am conflicted about this version of Irene, because I want to punch Steven Moffat in the face. In my headcanon, that episode ends when Mycroft cuts Irene a cheque. No unbelievable schoolgirl-ish stupidity with her (incredibly important) phone lock code, no humiliation, no rescue, none of that rubbish. Irene beats them because she is a badass, because that's how she's supposed to be in the story.
This was intended as an easy hall costume, although I can only wear those shoes for about 4 hours before my feet suddenly say OH HELL NO.
The dress is basically just a basic sheath with external darts and a collar that extends into the decorative strip that's pleated and tacked to the dress along the left side.
I ran out of time and ended up making a riding crop out of a fiberglass rod, craft foam and electrical tape.