This design is based on the Starfleet uniforms as worn by Starfleet Science and Medical officers in Star Trek: The Next Generation.

Complete with pips representing the rank of Captain (it is slightly unusual but certainly not unheard of for a blue-shirted officer to hold the rank of Captain) and the 2360s era combadge shaped like a Starfleet insignia, this is a great Star Trek design sure to make you look quite awesome.

Watching Star Trek while wearing this design on a t-shirt is a whole new experience, so be sure to have some nice hot Earl Grey tea to hand as you command your crew to "Make it so".