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A business top, party bottom approach to dressing. This is how you would dress at work on casual Friday.
Brian wore his skinny jeans to work on Friday, but it was totally appropriate since he had a button down and tie on top.

Casual Friday is totally legit for wearing hot pants and stripper boots to work, as long as you keep it all business above the waist. That's completely Bizual.
by Suck It, Trebek February 04, 2011