Cotton thread on polyester fabric can weaken over time. Fiber mismatch. Thread choice isn’t just about color — it’s chemistry. Using cotton thread on synthetic fabric like polyester can lead to friction, wear, and even fabric failure over time. Why? The natural fiber breaks down faster than the synthetic one it’s meant to support. Understanding the bond between thread and fabric is key to sewing that lasts. Have you ever stopped to ask: “Will these two work together long-term?” How do you match