This is a tough one. Short of choosing one of the extreme characters - as F8th noted - it's hard to find something distinctive enough to make it obvious who you are.

However, going as Moneypenny may provide something of an option that is:
- retro
- confident and in control

You could then embellish with the hat on the coatrack throw...

On the opposite extreme, Another option might be a gold bodysuit that mimics the painted (and suffocated) dancer from Goldfinger??