I decided last minute to go as Nymphadora Tonks for the HP premiere tonight. Not wanting to spend any money, I cobbled this together from pieces and fabric I already owned. (It's good to have a large supply of scrap fabric and old costumes)
She actually does have a second pocket on the right that's not visible in this picture, because it's lower and further to the side than the right pocket I put on. But because my jacket is more symmetrical than hers, it would have looked funny if I'd placed the pocket the same. I decided not to cut the hem like hers because I don't have as many fabric folds so it wouldn't have worked as well.
I've figured out a way to rig my hair (which falls to the middle of my back) into a short style like hers and will spray it purple and pink. I'll post a deviation in costume tonight.
Here's a deviation of the costume WIP: [link]
EDIT: Added myself