For some of us, receiving a smaller-than-average envelope in the mail signals a time-consuming social obligation. For others, the same little epistle means one thing and one thing only: Yes! Party! Whether you love or hate the saturation of invites that come with warm weather, one question is always there: What are you going to wear? And what exactly does "Creative Black Tie" mean? Or "Resort Formal?" We're here to give it to you straight. The last thing you need when showing up to your high school frenemy's wedding is to feel under or overdressed. Let's start with the basics and move on to some of the more modern invite attire looks, shall we?