It doesn't get much more classic and reliable than Van Heusen ... And shirt length is perhaps the simplest: lay a button-down you already love down flat, and measure from in between the collar ...

By old school standards, Oxford shirts were considered a scotch less formal than traditional dress shirts, given that the former had a button-down collar ... this one from Van Heusen, which ...

For most people, "button-down" and "button-up" are interchangeable, but they're actually not the same item of clothing.