Termed shirring. Nonetheless, the seem it results in is similar to smocking, which is an embroidery method that’s been around a long while. But maybe don’t google “what exactly is smocking” cuz evidently Furthermore, it refers to a thing that has almost nothing to try and do with sewing… In https://coveredelasticyarn80009.csublogs.com/38410213/an-unbiased-view-of-rubber-covered-yarn