So what is semi-formal for men? We've got you ... In order to understand semi-formal, let's start with formal attire—the dressiest of dress codes. In the U.S., formal means wearing a tuxedo ...

When you get an invitation with a dress code that says "semi-formal," it's likely you feel a little confused because, huh? What do you wear when the vibe is somewhere riiight in the middle?