One problem with that is that not all the articles are the same size. You can order 1000 t-shirts in the same size from a manufacturer and not all of them will be the same size (especially if you order the cheapest you can find).

This is mainly due to cheap fabrics stretching unevenly (roll to roll difference and beginning of the roll can stretch differently from the end) and if you cut them by pressing through a thick stack the ones at different spots in the stack stretch differently during the cut and thus end up different size even if "cut" to the same size.