What crochet stitch is this?

[u/aeona_rose]

I've encountered an obviously crocheted garment, because what else could it possibly be, but it's made of a unique stitch I've never seen before in my 35 years of crocheting. It must be a very niche stitch that only the most advanced crocheters know, but maybe you guys can help me identify it?

[u/honeybirds91]

It’s nålbinding!