All over Manhattan, and in any expensive downtown office center in the blue cities, this is what you see. Well-heeled men off to high-paying jobs wearing:
-Suit pants, mostly blue or gray, often striped.
-A spread or point collared shirt in white or blue or blue stripe; i.e., a business configuraiton, color and pattern; often french cuff
-Black shoes, duck-billed as often as not.
So this is how men have interpreted "business casual": start with the same suit, shirt, tie & shoes outfit you would have worn in the business formal era, leave the tie and the jacket in the closet, head for the office.
Whatever you do, don't do this.