I just found this online.
How do you repair a hole in a cashmere sweater?
In: Clothing [Edit categories]
do what I'm about to do: take some of those iron-on patches. Turn your sweater inside-out. Cut a small piece of iron-on stuff, and with heat on very low, iron over the hole. It will keep the hole from ripping and if the hole is small, no one will ever see it.
Tooraloora, December 2009