Why is this a bad thing? I mean, aside from any shrinking. My husband threw one of our wool covers in the wash and then dryer. Sigh... It didn't shrink much at all and seems to still be doing its job (I handwashed it and lanolized it to try to save it). Quite honestly, I can't tell which one it was of the three that we have, so the damage couldn't be that bad.
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Re: Felted Wool?
I have washed and dried wool once and it didn't felt. Sometimes it takes more than one cycle to see full felting.
Felting can make it not at all able to stretch, which makes it incredibly difficult to put on a child.
No, you're not wrong. In fact, I usually lightly felt sweaters before I sew them into covers, for that very reason.
But it CAN change the sizing. Sometimes dramatically. (Especially if you use hot water.) Hence why I felt before I sew. I've also overfelted before, and then even though the covers were the right size, they were so stiff and not-stretchy that they were hard to get on over DS's diapers -- think about the difference between putting on a pair of jeans vs. putting on a pair of sweatpants.
Mommy to DD1 (June 2007), DS (January 2010), DD2 (July 2012), and The Next One (EDD 3/31/2015)