Identified as shirring. However, the search it makes is very similar to smocking, which is an embroidery procedure that’s existed an extended long time. But probably don’t google “what on earth is smocking” cuz evidently Additionally, it refers to a thing that has nothing at all to do with sewing… https://elliottidtla.free-blogz.com/79158524/5-simple-techniques-for-rubber-covered-yarn