Pieces of fabric in new clothes

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Many times, when you buy a clothing item in a store, more specifically T-shirts, they usually come with a piece of material of the same fabric and color as the garment you bought.
For a long time, people thought that the piece of fabric was only for when you need to make a repair to the cloth, but it is not so. instead, it has the function of helping us to see how the garment would react in the wash, something of extreme importance! Even more if your clothes are delicate and you don’t want to damage them.