How would you go about creating a puff piece on the back of a bifold/money clip. Without the wallet being to thick. I use chèvre for the inside, and the lining. I’ve seen a lot of my favorite craftsman, use the chèvre for the outer layer. But they put a layer in between to create a puffy effect. I haven’t tried bonded leather yet. Please help me out with this question !

It depends on the thickness you want and whether you want the puffiness to stiff or soft. You can use anything from leather, to bonded leather if you want a stiffer effect or you can use foam rubber to create a puffy effect.