Unusual knitting - knitting with jeans, fabrics, leather

[Giulietta]

Hi to everybody:
I would like to knit market bag handles with jeans' lace and I am just asking myself if somebody has tried knitting with fabrics or leather on the forum. How do you proceed to cut or get fabric lace or very narrow strips of jeans, leather, etc. Has somebody knitted handles with jeans or leather? I would appreciate hearing from you.
Giulietta