Originally Posted by 'Hamas' Jenkins
Tattersall shirt and a pair of decent-looking jeans is rarely a bad look.
Pick something with a slightly slimmer fit. If you feel overdressed, just roll up the sleeves a touch.
Pretty much this.
Check invite to make sure there isn't a dress code.
Black v-neck or sweater is also appropriate. If you think it's going to be a little fancier, throw on a blazer. If it's truly a hipster type event, dress will be all over the place from "artists" in PBR T-shirts and ripped up jeans to "auteurs" in smoking jackets and ascots.