The feel of the fabric definitely changes after washing, it may also shrink a little. It is not unreasonable to wash a fabric item before wearing/using it, although in many cases it is unnecessary (but you don't know whether it's necessary or not before you try wearing/using it without washing). Occasionally, for example, you might get an item that sheds fluff/hairs/colour onto a little bit if you use it without washing it. When I buy new fabric, I always wash it before using it, because it tends to shrink a little and bleed a little colour. So.... SANE is the verdict, Jeannie!!!