basically, you have fabric that you cut on grain, it could be the lengthwise grain or the cross grain, but it doesn't really stretch when its cut this way. If you cut the fabric on the bias (cut diagnol) from the cross and lengthwise grains, its VERY stretchy. Therefore, great to do bindings for curved edges, great for appliqued flowered stems, but can be difficult to work with in a quilt. Very doable, people do it all the time with fabulous results, but they take more care and starch is your friend. Hope this makes sense...