What is appropriate attire to wear to an interview at a large, high-profile game development company for a mid-level managerial position (male or female)?
I believe that how you dress for any interview should always serve this goal : to Impress
Always in my interviews, I wear black slacks, black loafers, light colored long sleeves (tucked in), a necktie (not a noisy one ie too colorful or with a character design) and a black leather coat.
Other applicants might retract and think that you're being overkill or being stand-offish, but what I wear shows gives off the energy that I am a capable person and I mean business. Good business.
You should also be able to project what you wear. Stand up straight, smile whenever it matters and shake hands firmly. You should project confidence.
Of course, what you wear won't matter if you don't have the skills to back it up with, technically and orally.