2140s
Enterprise may have been one of the more recent Treks, but it gave us our earliest possible look at Starfleet fashion, in the years leading up to the Federation’s founding. These blue jumpsuits might feel like a precursor to what’s to come, but the thin shoulder straps of colors for Command, Operations, and Science divisions would rotate in and out of Starfleet for centuries to come.
https://gizmodo.com/star-trek-enterprises-must-watch-episodes-1843248830
