Originally Posted by
Tartan
Why not, I would wash them in hot water to felt them first. If they were felted you shouldn’t get more shrinkage when you use a hot iron on them.
Also, when felted they are thicker, so you don't have to use as many layers. Also, if they are felted first, you will be able to wash them in the future with impunity, knowing they will get no smaller. Probably.