Since I got the My Weigh mini precision scale a couple years ago, I am constantly surprised by the weights of the little items we use to make packs and tents. So everything gets weighed before use, and if on the high side, alternatives are sought. The only down side is that while these items are cheap individually, they add up and the costs (including shipping) are felt after a while. The weights of all those little items add up in the same way, also, when incorporated into the gear.
You may be refering to what is often called 'twill tape.' I found some at Green Pepper in a size not carried by any of the more popular sources (OWF, Quest etc.)
You can never tell till you order it if it will work in the buckle you want. Sort of a crapshoot, but gambling can be fun with MYOG if not too much $ are at stake.