UPDATE: Well, the "glasses case" I knitted did felt, at least on the burgundy stripes. The blue stripes are apparently a wool blend or superwash, because they are still gorgeous stockinette stitches, not felted blue stripes. And shrinkage was NOT 50%. LOL. So I am trying again, knitting a new case, using the burgundy with a little of the blue Donegal that I made a scarf out of in May. Smaller too, by a third. I think this will go much better.