A Shirt

Back so soon? Yes, I am.

"What would simply be referred to in the U.K. as 'a shirt' is known as 'a button down' in the U.S."

Hey, fellow USA'ers, I've only lived in the middle of the USA (OK, WI, AR, NM, IL) but I've never known anyone to call it anything but a shirt. As Milady says, this brings into question some of the other word contrasts.

"Button down" only refers to the hatches. Oh, wait, no, that's...