Boushh

From Fettipedia

Bounty hunter disguise used by Princess Leia

Boushh was once an Ubese bounty hunter that was killed as a result of it's greed for the payment it tried bargaining for on a bounty. However since the hunter's death was something done in secret, Princess Leia was able to take it's helmet and uniform and assumed it's idenity for a short while to help her infiltrate the criminal underworld. It was while under this disguise that Princess Leia pretended to have captured Chewbacca and taken him as a prisoner to Jabba the Hutt's palace on Tatooine so that she could rescue Han Solo.

Unfortunately, for Leia, she and Han were both captured by Jabba's guards before they could escape the fortress.