If it's got to last than your tin cloth is about good as it gets. It doesn't do an lot of things well, but I consider my tin garments as an wearable shelter system that will take a beating and hold up to abrasion. All they need is an waxing from time to time. If you need insulation than underlayers can be worn.
My Filson tin jacket has an zippered wool vest in it that can be taken out if wanted
