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1.
An attire that includes a plain white T-shirt and usually blue jeans. In the summer, blue jeans are usually replaced by khaki shorts.

This form of attire is mostly seen in the commonwealth of Kentucky. It's deemed appropriate to wear at any event that doesn't require formal attire.
Guy 1: What should we wear to our friend's birthday party?
Guy 2: I think Kentucky Casual would be fine.
Guy 1: Nice, you got a white t-shirt that I can borrow?
Guy 2: Yep, got a month's worth coming out of the laundry right now.
by christoph125 July 22, 2012