Be very careful with WalMart fabrics. Some are terrific, others are indeed garbage!
If a fabric it too thin, it doesn't get thicker. And if it has a stiff and starchy feeling ... it will be nasty after washing. The stiffness can easier mask cheap fabric as a filler to give the fabric more substancial feel.
That said, I will look for these flat folks. rightnow, we still have a walMart near me that has a real fabric dept.
Julie