Buy Letterman Jacket Black with 100% Polyester. Of all the different wearable items that can be embroidered, Jacket would appear to be the easiest. When most of think of jackets in terms of embroidery, large areas for full back and left chest designs come to mind. What many of us often forget are the little curveballs apparel manufacturers are adding into their designs such as box pleats and seams down the back.