>>1782917You vastly under estimate the strength of textiles. Jo-Ann's isn't crap, and their upholstery brocade's will hold you fine. If you're still worried, back it with cotton duck or canvas. Feel the fabrics. It'll be fine.
Pic is my favorite camp stool. I take it everywhere, and has say my fat ass on it in full 15thC harness and more for over a decade. It's cheap Walmart cotton canvas.