I f you're heading to a summer wedding in Europe—or just fantasizing about one—you might be wondering what exactly to wear.

Some of the rules are pretty straightforward and easy to follow (e.g., don't wear white ... show up in another wedding dress! Or something else you know will pull eyes in photos later on.

Demi Moore's 'robing' style hack is the perfect way to give evening wear a contemporary update, and we'll be using it for ...