Most uniforms are crap and cheap.
Yes some really are, but in most cases that really doesn't matter. For me it's about having a starting point for the session, whether it's
* yes officer, I've broken the law and need sorting out
* yes nurse, I've got a problem here I need you to take a look out
* take a letter, Miss Jones, I've got a pen in here somewhere
As soon as action in underway the roleplay goes by the wayside. The exception being that when the police officer has finished the full intimate body search I can take great pleasure in corrupting and degrading the officer.
I find it awkward to just go in "cold" and start sex without a (short) preamble.