Basically, the FedRom uniforms all suck, trying too hard to be Firefly. But the KDFRom uniforms are masterpieces once you add some colour to them. I use Red-Purple and Blue-purple for tac and sci respectively (maintaining the established colour code, but making them interesting - and dark). For engis I use a dark green.
I use the metallic colours, gold and silver to designate rank groupings. Gold for command, silver for non-command boffs.
However, the KDFRom boots for the women are injuries waiting to happen, so I use miners' boots for everyone.
Unfortunately, the devs haven't gotten around to giving us security escorts and ship crew with uniforms other than the butt-fugly FedRom ones.
If we had a Romulan nemesis uniform option in the C store. I'd spend zen for it no question. However I fear that cryptic has released all the costumes that Romulans' are going to have access too. Heck I'd even enjoy seeing a C store option for the Romulan TAS uniforms shown in the old cartoon.