HMF the name of this sort of nylon webbing clamp/clip/fastener. it is commonly used on public transport to secure the hanging straps! I know the whole item is called a tsurikawa :
Pony 1" x 15' Nylon Band Clamp with Ratcheting Handle
FOROREH Frame tensioner band tensioner with 4 jaws, aluminium angle tensioner with 4 m nylon strap, corner tensioner, corner clamp, band clamp for picture frames, drawer : Amazon.de: DIY & Tools
CRL ST83159 Web Strap and Clamp
Miter Band Web Clamp with 13' Woven Nylon Strap for Boxes, Drawers or Picture Frames Online now - onwardrerve.shop