Designers rarely consider thread tension, but it is critical. If you use a high-tension, non-stretch thread (e.g., cheap polyester) on a fabric that needs to move, you create a "guillotine." Every time the wearer moves, the thread holds rigid while the fabric stretches. The fabric loses that battle, cracking along the seam line.
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Rayon is a semi-synthetic cellulosic fiber. Its low wet strength (when wet, it loses up to 50–70% of its dry tensile strength) and high extensibility make it vulnerable during: Designers rarely consider thread tension, but it is critical
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