There were a few Mako Mori cosplayers running around, but she was the only one I saw in full Jaeger pilot gear.
ETA: I found the name of this cosplayer! She’s Stella Chuu, and she’s a friggin’ DYNAMO. Not only does she do gorgeous cosplay, but she’s also an incredibly talented Burlesque/Nerdlesque performer and pin-up model from NYC. She’s on tumblr too, so go check her out!