Yes, you can mix the sizes/colors of the garments as long as the print artwork is all the same size/color and location. If you are screenprinting or DTF youth and adult sizes, that will require us to resize the artwork, there will be an additional charge for materials. And if artwork is created for a light colored garment, we may have to switch out colors for a dark garment for a small fee which depends on how many colors need to be switched.