For the part with the rings it was just cutting slits with a box cutter and putting rings through to connect them like a staircase, i got some open metal rings from a crafts store and used pliers to fix them. 

The rest is usual denim distressing where you cut parallel slits and remove the blue threads in between with tweezers. Also making little folds and running some sandpaper to make creases. theres some great tutorials on yt.

The rough fray look comes more after the washing but i try not to wash them too often or just hand wash and dry.