I was rather taken aback one Friday about eight years ago to encounter a doctor in actual blue jeans, under her lab coat. Apparently this clinic did casual Fridays.

I have spent the last five minutes trying to remember what I've seen doctors wearing since then, and all that's coming to mind is, "lab coats?" I would be startled by a dress, though come to think of it, I think I have seen male doctors wearing ties.

And I agree, khakis and a sweater count as business casual in most settings I've encountered.