I’d classify those as “button-down”. I’d also classify anything with 2-3 buttons (or room for them) at the top and no other buttons as “polo”. At least, in the context of telling someone what type of shirts to wear.
Side benefit of this thread already! I learned a new word. Fightin’ ignorance!
So in the OP when I wrote “button-down” what I apparently meant was a Windsor collar. I guess this thread really is “name styles of collared men’s shirts besides polo and Windsor.”
Are you really specifying that it must have a collar? Because there are v-neck pullovers too, but they have no collars. There’s also boat-neck and cowl.
Interesting fact: all men’s shirts used to be part-buttoned. Shirts that button all the way down are a relatively new development that didn’t really catch on until the 40s.
Sweaters typically are acceptable as business casual when paired with slacks, aren’t they? Without a collar, I mean. If you have to have a collar, you can wear it over a button down shirt.