For instance the Squash Blossom Skirt can fit one to two sizes bigger or smaller. These are sizes after shrinking . During the dye process I wash the garment in very hot water, and dry in a hot drier. I suppose you could shrink them further, but you are going to have to work at it. If you don't wear or soil a garment, you may wash and dry a white garment to check size and still return it if you need to.
Sizes are equivalent to most standard sizes.
Sizes run really small. This is because Americans all think that bigger is better. My three month old wears an 18 month size. He must be really superior. You know some times you just get tired of making the same old thing.