The Boba Fett ESB Promotional costumes are several costumes that are often referred to as Sandy costumes or tour costumes.
In addition to the costumes created to be seen on screen, three of the Boba Fett costumes were finished by Sandy Dhuyvetter's Daydream Productions and primary used for a series of tours throughout the US, Canada and the UK to promote the Empire Strikes Back. These costumes are a bit of a mish-mash of parts with armor plates and helmets being randomly combined from other costumes and between each other. These costumes are primarily defined by their chest armor which are designated promotional armor 1-3.
This photo depicts Promotional Armor 3 which is accompanied by the First Prototype Boba Fett Helmet.
Note the Empire Strikes Back Blaster Rifle which has slightly different detailing than the rifle used in the film.