Master cosplayer Malicous Cosplay, who recently redressed Princess Leia as Streetfighter's Chun-Li, once also depicted Princess Leia as a Starfleet officer from classic Star Trek . Ensign Organa dresses in white and wears hair buns, as in Episode IV. She carries a phaser in addition to a blaster.
My favorite part of the cosplay is imagining Chewbacca as a tribble:
Princess Leia in Classic Star Trek Cosplay
