Below are some suggested sources for softshell fabric to create the Andes Jacket. While I haven’t personally used these vendors, they come recommended by members of the Itch to Stitch Facebook group. Keep in mind that fabric inventory frequently changes, and I do not actively maintain or update this list. If you have alternative recommendations for fleece-back softshell fabrics with stretch, kindly share them in the comments. When making fabric purchases, carefully read the descriptions and engage with vendors by asking questions to ensure the suitability of the fabric for your project.
Seattle Fabrics: https://www.seattlefabrics.com/Softshell-Fabrics_c_276.html
Amanda’s Bundle: https://www.amandasbundles.com/collections/soft-shell
Nature’s Fabrics: https://naturesfabrics.com/search?q=softshell
Discovery Fabrics: https://discoveryfabrics.com/collections/softshells