That outfit was seen occasionally throughout the first season on a few different men.
The dress uniforms in TNG season 1(2?), that tunic and stocking combo, were basically something Emma Peel would wear.
What was the female dress uniform in season 1(2?) if what the women wore wasn't identical?
Because by Insurrection, Bev was wearing the same standard (unisex?) dress uniform just like the boys as if she's allowed to crossdress at formal occassions?.