How does sizing work for factory designs?

The factory is going to use their standard size table to develop the sample but you can request to switch sizes if you believe that their sizing table runs too small. 

Example: The factory is going to ship you a shirt in size Medium, but once you receive the sample, you notice it runs too small. You can ask the factory to consider their size Medium a Small for all your orders. You can do the same for all the other sizes.