A buttoned up trench coat and bucket hat give you that very fresh secret spy look.
Done correctly, you'll like a dope Cold War-era spy. But if you fail, you'll look like a creepy flasher. Still though, it's worth the risk. Just button your trench all the way up, throw on a bucket hat and sunglasses, and let your tie peak out. Just don't be surprised if you start getting tailed by government agents/child protective services.