It only took me about 2 minutes to do this rough draft to see how it would look.
I just put a long sleeved red tshirt over a black tshirt with a smaller collar.
I pinned on my insigina, and that's it.
Im gonna get a couple of pink shirts, do a couple stiched to give the collar a vneck, and sew on a couple of braided ribbons from a craft store to the sleeves.
It's a very easy DIY project, the hardest part is to find the starfleet pin, but you could make that from fabric and sew it on too.
I prefer the pewter pins tho, my bf got two, an operations and a command.
Oh yeah, and we're gonna wear short short with them lol. Nothing like a couple of big guys in short shorts lol.