I've done it several times actually. I've done The Scout (Red Team) [http://www.cosplay.com/costume/309103/], a Ghostbuster [http://www.cosplay.com/costume/309100/] and Joanna Dark [http://www.cosplay.com/costume/322846/]. I'm aiming to do N7 Armor this year, but based on how much work it'll take (if I make it by hand) and how much it'll cost (if I buy protective gear and/or buy the materials to make it by hand), that might not happen. If that's the highly likely case, then either I'll do something else loosely Mass Effect related or I'll do the plan I originally had a few months ago, my Fable 3 Hero.