I have yet to run by anyone using those four uniforms though.
One of the imperial ones is nice, and I would use it if it didnt mean having to strip all my mods out my current armour and add new augment slots to the GSF one.
SWTOR really needs a cosmetic outfit system which is worn separate to gear, similar to what other MMOs have. Then maybe the new gimmicky armours they release would see more use
(Lord of the Rings Online has one)