Shirtings are smaller scale prints used to make men's shirts in the 1800's - Keepsake Quilting has SHIRTINGS listed in their website - take a look at them to get an idea of what's needed for class in terms of color, pattern scale and design. What's needed - above all - is 100% cotton fabric; if you buy fabrics to make shirts from, there's "guaranteed" a polyester element to them.