I’m exploring ways to modernise heavy wool outerwear without turning it into a stiff plastic-feeling garment:

What are the best lightweight, breathable windproof linings (e.g., 2-layer ultra-thin TPU or soft wind-stop barrier) that won't distort the drape of structured tweed coats?

Has anyone had success applying bio-based water-repellent sprays/treatments to raw or recycled wool yarns prior to weaving/knitting without affecting the natural softness and breathability?

Would love to hear how other heritage or outdoor designers balance traditional natural fibers with modern weatherproofing techniques!