Long sleeve dark shirts, XLwomen's (West Toronto, King/Dufferin)

Hello, I'm in a college program where we're required to wear dark shirts, high necked, but not turtle necks necessarily, to work with clients while on placements, and then practicing while in class. These shirts cannot have any patterns or prints on them whatsoever, they just need to be a solid dark color. Depending on the material and cut, I would take a L - XL. Thank you for helping a struggling student!