So, yes, I did say I wasn’t going to buy any more fiber until I’d made a significant dent in what I already had. (And I can already hear you chuckling to yourself.)
But, there are certain circumstances that are just plain not worth resisting. And in this case, it was because I had never heard of nor seen this particular kind of fiber before. Well, that, and because it was shiny.

This is called banana silk. It’s derived from the leaves of banana trees, so it’s a plant-based fiber, and you can see how shiny it is in the pictures. I’d heard of yarn that had banana fiber in it, but it had never registered in my noggin that that would mean there was banana spinning fiber floating around somewhere to be pounced on.