The cutest dog outfit in the world still fails if the fabric feels wrong. In this Boston Made Pets guide, we break down the best dog clothing materials — including cotton, fleece, stretch knits, polyester blends, waterproof shells, and lightweight cooling fabrics — and explain exactly which fabrics work best for different dogs. Learn how to choose materials based on comfort, mobility, temperature, sensitive skin, and anxiety, so your pup’s wearables feel as good as they look — the Boston Made Pets way.