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Does every shirt fabric listing mean the same cloth?
No. Shirt fabric is cloth for a shirt block: collar, placket, and cuff need stability or a planned knit substitute. Woven shirting and jersey tees are both shirts only if the pattern agrees.
Can you skip sampling shirt fabric?
Collar sew test plus wash test.
What should stay on the brief besides the keyword shirt fabric?
Stability, opacity, mass, and wash. Using coat canvas as shirt fabric.