Jeans and a nice shirt are usually fine. Thursdays dress code is typically a bit more casual with Fridays and Saturdays being a little stricter. The most common “no’s” are gym clothes, tank tops, jerseys etc
Some people can get away with Expensive brand t-shirts but usually guys wear at least polo shirts. So upscale casual is in the ballpark for the dress code.
I've seen guys in jeans but I can't recall seeing one with a Tshirt
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