Wearing an uniform in the sim to make it more realistic? Come on, and do you start calling the examiner Sheila and ask him to get you some coffee? Do you also spread cookie crumbs over the pedestal for added immersion? Do you stand outside the box after the session is over to wave imaginary passengers off?
Just plain ridiculous, it's a SIMULATOR, it's not and never will be the real aircraft!
And no, we don't wear it at my company LOL