There are a number of reasons that we release shirts on a pre-order basis. The most important reason is so that we can offer you exactly what you want. Normally, we will order medium, large, and extra-large shirts when we release a new design. However, if we release it on a pre-order basis, you can order any size you want.
Also, you can request pretty much any style and color offered by American Apparel. There are different costs associated with different styles though. Keep in mind, if you order a different color of shirt, the print color and design will remain the same.
Lastly, if you pre-order a shirt, you will be sent your shirt as soon as we receive them in our warehouse. There is no risk of the shirts being sold out or on back order.