I recently took on a large sofa project and ordered foam based on the supplier's labels. When it arrived, the cushions felt much softer than advertised. This set me back a whole day while I waited for replacements. Now I always test a sample piece before committing to a full order. It's a simple step that saves so much trouble.
While in Florence for a vacation, I visited a small leather workshop. The artisan demonstrated a double-stitch technique passed down through generations for high-end furniture. This method loops the thread back for added strength, something I hadn't encountered before. Testing it on a project back home proved its durability under stress. I believe sharing this could benefit others working with leather upholstery.
Test all natural materials in a controlled environment before full-scale use.