Here's an Internet Archive link to a snapshot of Bagginsbill's Sequin Shaders for Firefly. At the bottom of the page is a little blue download arrow. There will be a momentary redirect and then the zip will DL. It's not the Sparkly Shader you show but it's similar, or at least it's sparkly. It's probably very complicated node arrangements...

BB Sequins Shader page snapshot

I get the feeling that it's not really the Sequins look you are going for though. More of a 1960s 1970s Glittery fabric you might see on a dress in a sci fi ensemble...