The Boba Fett figure was out way before ESB though, especially if you sent in your Kenner proof of purchase seals. 😃
So was the costume built before the Holiday Special cartoon was made?
Yep! See this article (https://www.starwars.com/news/the-real-first-appearance-of-boba-fett) to learn about Boba Fetts first public appearance in September 1978! Also, the old Kenner figure was based on one of the preproduction suits as seen in the databanks of the boba Fett fan club site above.
