A casual spring wedding is supposed to be fun, not stressful. But that doesn't mean you won't be hit with that dreaded thought: damn, what am I gonna wear? Even if you aren't an actual invited guest—perhaps just somebody's plus-one—you'll want to look your best and feel good. Thankfully, this is the easiest kind of wedding to pull a look together for. Our foolproof suggestion for a comfortable, breathable suit and a statement shirt (sans tie) will ensure you're among the best-dressed dudes at every reception this wedding season. Here's what we're pulling on before heading onto the dance floor.