We’ve done the googling for you and almost every sartorially savvy man out there agrees, a smart-casual shirt should be the hardest working investment in your wardrobe. It should be your go-to for all occasions, especially when the invite isn’t specific about the dress code. It should have a collar, but that doesn’t mean all collared shirts are up to scratch (put that flanno back in the laundry pile in which you found it!). It should be casual enough to look good intentionally untucked, but smart enough to make a plain tee look a little bit snazzy layered underneath. And most importantly, you should probably have more than one in your rotation.