@MrsN14: It is a nice look. I prefer it when the pants and vests are not identical, but have a bit of contrast. To me, though, it’s more of a fashionable look (as opposed to stylish) witht the loosened tie, top button undone, etc.
It is very fashionable right now, and I think it’s fairly sharp. I don’t know that it’s the best choice for a wedding, becuase it is a very current look. You may not like it as much in your pictures 20 years from now. If you want to be less formal, I’d go with two piece suits, no tie. If you want to give it an even more youthful and informal look, go without belts.
Sartorially speaking, this is how to wear a suit, in descending order of formality:
Jacket, vest, and tie.
Jacket, belt, and tie, no vest.
Jacket, and belt. No vest or tie.
Jacket. No belt, vest, or tie.
No jacket – just shirt and pants. Usually needs a belt, but not always.
Please note that shirts and pants are worn with all of these options 😛
If we’re talking parts of a suit, Vest, Shirt, Tie, pants, no jacket, generally says “I’m at work, got a bit warm, and took my jacket off.” Having a jacket, you can always remove it, so if you were to go with three piece suits, the guys could remove their jackets for some photographs, and remove them or wear them throughout the day as they please, but have them on for the ceremony itself. You can get the jacket over shoulder photos, etc et
Some notes on vests in general:
Never do up the bottom button.
If it is part of a suit, whether matching, or contrasting, do NOT wear a belt – wear suspenders, and ensure the vest covers the waistband of the pants. If you want the belt & vest look, you’re into more of a casual/streetwear/denim area. If that’s what you want, go for it! I have an old three piece I got at a thrift store, and I wear the jacket and vest with jeans and a belt all the time, but it’s definitely a casual, trendy, way to wear a suit. I will probably look back on that outfit in 20 years and laugh at myself – and that’s fine with me if it’s not in my wedding photos!
So, consider whether you’ll care about the “trend” factor in the photos, years from now, and what overall level of formality you are after for the ceremony. Persnoally, I know some guys are afraid of jackets, but iI think those guys need to get over it and embrace dressing properly. Jackets look great on a men, so long as they fit correctly.