I keep my jacket on throughout the day at my desk. I really dislike the shirt and tie but no jacket look. It looks very half hearted and unfinished to me. Yeah, but you're a stuffy old turd. Whilst I would NOT trust it to cloak room staff as a principle take it off it you feel comfortable and it is appropriate for the place and the people you are with. There is too much rigidity in old fashioned dos and dont's. Circumstances dictate. Well said, sir! I couldn't agree more.