I've posted these here before, but felt like drawing something new.
These uniforms could be used on a ship or station with combined command and ops divisions; the colors line up with ENT/DIS/TOS/TNG eras simultaneously by using two color pairs - red/gold and blue/silver. It's also got the DIS side panels combined with the later tendency towards bold solid colors. The shoulder panels and belt make it pop even in a small drawing with thick lines.