Bail wears this outfit mainly while on Tantive IV, but also on Polis Massa and when he picks up Yoda after the fight with Palpatine.
The outfit consists of a light grey jumpsuit with a silver embroidered Royal Alderaanian symbol on the left sleeve, a belt worn above the hips also with the symbol on it, black boots, metal gauntlets with orange and red lights, a holster and blaster hanging on the right side of the belt, and a asymmetrical sage green cape that covers the back and right side as well as both shoulders. The cape has three large folds on the left shoulder which runs diagonally down to the right.
The Force Unleashed
Bail wears a variant of this costume in The Force Unleashed video game and its comic retelling.