Could anyone help me sort out my confusion over the crossover between pick and pick and hopsack? I feel that a grey pick and pick can look very pleasing. Those I have seen look like a hopsack weave to me, although in the finer weaves this is hard to tell. I understand that hopsack is more casual and less dressy than a twill...although Morning dress seems to be a hopsack pick and pick, and that is considered formal. Can a pick and pick be either  a twill or hopsack? Or, is the hopsack weave used to emphasise the look and surface interest of the pick and pick pattern. ....can anyone help me get this clear in my mind?....thanks?