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.
These photos depict Promotional Armor 1 which is often accompanied by the Return of the Jedi Boba Fett Helmet.