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"It's not a formal dinner if \"jacket and tie\" are required, but in these semi-apocalyptic times I guess that often passes for formal. I find it hard to believe you graduated from an Ivy institution and didn't notice what the lads were wearing. A jacket means that thing with lapels, not the thing you wear fishing or to the bowling alley. For your purposes, it should probably be a suit jacket, worn with suit trousers. Or you could wear a blazer\u2014I'd suggest navy blue unless you've won the Masters golf tournament, in which case green would be nice. Gray trousers will go nicely with the blue blazer. Don't wear khakis; they're too daytime. Fabric weight? I'm guessing that in Ivy League climatic zones a tropical wool will work. If it's hot, you can go linen. But if you think the dinner is formal, keep it on the dark side and wear a suit."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.gq.com/story/jacket-and-tie-formal>