Oversize the combadge, tweak the collar, oversize the rank pips (and make them independent of actual rank). Toss in Vulcan/pointed ears usable for all races.
Because it's phony, any faction can wear it..
There's a certain appeal, I think, to a uniform that encourages you to "be bad" and impersonate a higher ranking officer, a Vulcan, or another faction. And the pointed ears unlock, much like the Seven of Nine Borg bits, are a great RP costume addition for anyone who roleplays a hybrid or wants to look Vulcan for the day.