Known as shirring. Having said that, the glance it generates is very similar to smocking, that is an embroidery approach that’s existed an extended while. But it's possible don’t google “what is smocking” cuz evidently Furthermore, it refers to a thing that has nothing to do with sewing… Anyway, shirring https://louishqydk.blogdun.com/32391583/about-covered-spandex-yarn