From the feedback I've received over the years, USBC seems to really care as to whether the fabric is a "true" tshirt or a performance fabric.
I've also been told that "if the whole team has the same shirt, tshirts are ok" - BUT I know that's not always true.
I think it just depends on who's checking you in - on the borderline cases.
I know that the two teams we're sponsoring are wearing collared shirts for everything.
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