I'm going as Black Widow to the Birmingham MCM Expo next year. I'm hoping to go to the London one too.
So far it's going well: I have the catsuit, the wig, the boots and I just have to spray paint the Widow's Bite bracelets which I made out of a bullet belt from a fancy dress store. Still working on her belts and guns and I need to sew SHIELD patches on.
For my first superhero cosplay, it's going pretty well! I'm excited!