I prefer using shock cord rather than paracord or other cord that doesn't stretch.and I may or may not be known for pairing zip ties with shock cord. Haha, I have versions all over the house for all kinds of stuff. Wife make fun of me.
Make the zip tie just the right tightness and it makes the shock cord adjustable. Not too tight, not too loose. Works like a charm.
The hardest part of making my own tabs is finding Horween cordovan. It makes the best tabs. You'll lose it before you wear it out. Gets better the more you use it.
If you have a choice of the thickness of the leather, go with thicker because you can always take the backside to a belt sander to adjust how thick you like it. The leather onthis tab was a little thick. 20 seconds, and light pressure on the belt sander and it's just right for me.