Part of the Quality Assurance process, and specifically refers to how many millimetres bigger/smaller than specified are acceptable per measurement point on the item. For example, if the specification length of your t-shirt is 50cm, then the tolerance would mean that a length of 49.5cm or 51.5cm would also be acceptable. This is due to there being a tolerance measurement either side of your ideal 50cm. It’s almost impossible to sew a product absolutely 100% to specification, therefore a tolerance system allows a level of understanding and approval while maintaining a consistent assurance method.

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