I looked at those exact chaps as a reference. I was considering telling my friend to buy those, as I think my cost for the leather would be close to the cost of those chaps. I'm still at the buying veg tanned at Tandy stage, I am an elite member though, so I get close to what I think is wholesale, but still... That looks like at least 5 sq ft. The type of leather varies, too, from chap to chap. I've seen some type of split/suede to full on thick veg tanned. Also in this picture, they don't show how the belt is buckled, or if it is even buckled.
I've also visited the ranch supply store, and looked at their chaps, pretty easy indeed. As with all things, the devil is in the details, I don't want to overlook some crucial feature. I'm new to leather, and I have such a reverence for the material, and the animal that produced it, I get skittish when it is time to cut! It is also so expensive, I can't take a loss.
Thanks for your thoughts, though!