Known as shirring. On the other hand, the glimpse it makes is similar to smocking, which is an embroidery technique that’s existed a protracted long time. But maybe don’t google “what exactly is smocking” cuz apparently In addition, it refers to something that has nothing to do with sewing… In https://kylergdsjy.tinyblogging.com/the-fact-about-smoking-thread-that-no-one-is-suggesting-75429409