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How to make a stiff t-shirt look and feel vintage - will shrink, so buy large: Wash 3-5 times in hot water with 1/4 c sodium carbonate washing soda 2 c salt (use smaller batch after first wash do not added directly onto shirt). Dry on high heat after each wash. Using fine-grit sandpaper, lightly swipe over logo in circular but irregular strokes.
DIY Yarn Crafts : How to make t-shirt yarn