I made this in a little less then 2 weeks as I was a masquerade judge for Youmacon and needed a costume to wear!
I did the "coat" part by luck, I drafted a pattern and it worked. The boots were originally black and spray painted red. The wig is a Jeanie wig from Arda wigs.
I put a piece of pantyhose in the chest of the coat and glued the "gem" to it so I didn't have to attach it to myself.