I’m a fan of denim shirts, as long as one doesn’t wear them with denim. Good with a suit and tie, I think, but it’s not easy finding an elegant non-Western shirt—perhaps someone will make an off-the-rack one, one day.
This one (by American Apparel) is great—no button down collar, which I don’t think is right for a thick material like this—and a collar bar works nicely with it. It’s not exactly denim, but close enough for comfort (literally). With a solid wool tie—customized here by myself with three different Sharpies—and a tweed suit (with very baggy trousers) that reminds me of my geography teacher in English boarding school, it’s a departure, but not so far, from Downton Abbey.