alt Hacker NewsThere was a great custom order screen printing website blog where they documented their shrinkage testing. They made a pressure sensitive shirt form and then ran 30+ brands of shirts through a battery of tests, measuring fit after each washing.
I've heard reports that the newer heat pump clothes dryers are less prone to cause shrinking. In their default mode they act more like a dehumidifier than a heater. In theory you can wash more delicate dry-clean only garments as well.
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Do you have pointers to good sources you've found about that? I've been wondering about exactly this from an optimization-of-the-laundry perspective.
(I've been tempted to just yolo buy one to try it out but installing it in my house is a pain in the rear because of the location.)
I have a heat pump dryer, and I can confirm no shrinkage.
It's very gentle on clothes, but it does take a bit longer to dry.