The famous Aspiring Knight's Vest
. And I really like to have more open, lighter outfits for all classes.
The imperial dancer outfit on rep. characters (if its still exclusive only for the Security key vendor, then both sets should be sold for both sides).
Ascendant's Alloy Boots
from the Light Side Vendor
Bounty hunter armors
for republic companions. Quizen or Akavi comes to my mind immedietaly.
And Satele Shan's outfit.
Or something similar, on that fashion.