The reused Romulan uniforms in ENT never bothered me in the slightest. A Romulan's a Romulan, right? Trek's been recycling stuff for 45 years now! Klingons, Romulans, Ferengi, the ships and gizmos... they all look pretty much the same throughout Trek's 250 years of pretend history.
My guess is Neelix once made a delicious stew but never told anyone what was in it.