Apple’s latest limited-edition accessory is a crossbody cloth strap designed to fit every iPhone. Apple calls this pleated, cloth accessory a "singular 3D-knitted construction." The sock element where you place your phone can be stretched, allowing you to put in other small everyday items.
https://www.pcmag.com/news/apples-new-iphone-accessory-is-part-sock-part-crossbody-strap