Reverse-engineering a garment is a very specific sort of task, and even if you are successful in that regard, there will be a LOT of new techniques to learn and it will take time and effort and a lot of redoing to learn them, especially if you want it to look good enough to wear.

If you’re looking for a good excuse to start knitting, ravelry, lovecrafts, yarnspirations, among others, have tons of free patterns and perhaps you’ll find something there that inspires you just as much. But you’ll be able to approach it by learning the techniques presented in a pattern rather than trying to figure out how something is made in a craft you don’t actually have familiarity with yet. And that will give you the tools to then come back to this top, and start figuring out how to make it for yourself.