Dear All: It's me again asking silly questions on this board. I bought a Brioni navy cashmere sweater on ebay which fits me perfectly except that the collar is too large (possibly, I suspect, due to hanging on a hanger by the previous owner). Is there anyway I could shrink just the collar part of the sweater? The owner has offered a refund but if I could shrink the collar successfully I would very much like to keep it. Thanks.