I'm not saying it's wrong. I'm sure it's absolutely correct but I have never been to a wedding where all male guests have worn black tie post 18:00. I must mix in the wrong circles.

I'm also thinking that the tweed jacket would be acceptable at a wedding as it would do for the day and the night do. Depends who's wedding it is I suppose.

Jordon.
Re: removing your jacket. As MoR explained it isn't the Gentlemanly thing to do.

I have an example if you'll bear with me. When I was a young Sergeant and new to the Mess and it's etiquette, I attended a Christmas Ball. Due to the constraints of floor space in the building, it had extended onto the lawns and under canvas. A fellow mess member's wife was finding it a bit chilly to be essentially, outside without her coat on so her husband proffered his mess jacket for her to place around her shoulders. Very chivalrous.

After the RSM had finished waving at him, he'd landed himself 15 extra duties... (that's day on, day off for a month by the way). On Monday morning he reported to the Top Soldier to request a reprieve as he belived he had only done the gentlemanly thing for the comfort of a guest to the Mess. He left that discussion with his 15 increased to 30 for having the audacity to question the Presiding Member's authority.

These sort of incentives encourage you to keep your jacket on even if you have melted into a pool of salty water on the floor. It becomes like second nature NOT to remove it. Incidentally, the only time I've seen more extras handed out at a dinner was to a PT Corps Sergeant who did the 'Dance of the Flaming Arseholes' across the table tops of his leg. He got 180 duties... (day on, day off for a year!) but then again he did deserve it, even if it was one of the funniest things I've ever seen.