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My main objection to your methodology is the use of a cotton jersey T-shirt, which is not commonly ironed. A better sample would be a cotton dress shirt. However, it's interesting to note that you disproved your theorem that ironing caused undue wear to the fabric.
Of course applying a piece of heated metal to a piece of cloth causes wear. So does the act of immersing a piece of cloth in a chemical bath, agitating the bath, and then putting the cloth in a rotating metal cylinder. However, try going without washing or drying your clothes for very long . . .
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