Originally Posted by Mr. Moo
Wow, I did not know this. Thanks all.
So, to clarify, even if I am dancing and sweating like a pig I should not take the jacket off? What about whilst sitting in a car? Can I keep it off then?
Dude. There are no "rules." No one is going to castrate you for taking it off (not even us). If you want to take off, go ahead. Perhaps the preference is to keep it on the whole night by "people in the know." I personally like the look of having the jacket, and don't like the tie without jacket look (looks high school to me). But if I were dancing, and I got hot, I might take it off, weighing the fact that I rather have people see me sweating in my shirt rather than me sweating profusely in my $1000 jacket.
Here's a tip, if you're concerned about doing the "right thing" style wise. Look around what other dudes are doing, and do the exact opposite, and you'll be just fine.