Note that most of this stuff will not wash without shrinking.
You can minimize shrinking though. Cloth shrinks when the fibers are crammed together and the microscopic barbs on the fiber hook together. When that happens, they never come apart again. It's worse when they're wet. Agitation makes it much worse. Heat causes minimal problems.
Wash wool in cold on the gentlest cycle your machine has. Then hang it dry. Tumbling will cram the fibers together no matter how warm or cold it is.
