At General Electric Medical Systems Business Casual used to mean no denim or canvas shoes with a sport coat or blazer, tie not required.
Chinos, (Khakis) bucks or loafers with polo shirts and sports jackets were quite popular.
My first day on the job Jan. 1, 1988 my boss, a chemist, told me that G.E. was a very conservative company. I should wear suits in three shades or grey or navy blue with any color shirt that I wish, as long as it's white!
But now that I am 60 and over the hill there's no telling what one can get away with.