[needed]

1.) suit; - just a gray two-piece suit; pretty simple.

2.) shirt; - a plain white shirt, button-up.

3.) tie; - a dark green tie.

4.) shoes; - loafers! see? his costume isn't too hard.

[optional]

5.) gun; - since you meet Kaufmann when he's shooting things, you could get away with carrying around a gun.

6.) white claudia; - Kaufmann is a dealer of white claudia; therefore a bag of WC would be a fun prop.