This seems like a reasonable idea. The boiling point of water drops pretty rapidly with pressure I think. This would be good for heat-sensitive fabrics.

Also, it would be good for a dishwasher, with the added advantage that the seal would be easier, as you don't have a rotating drum to deal with. My dishwasher, at any rate, doesn't tumble dry!

Robert Heinlein mentioned this in one of his books. (Stick the clothes in an airlock and evacuate the space.)

Unfortunately, I don't think it'll work on stains consisting of solids.

You'll need a reinforced metal wardrobe, hermetically sealed to prevent air coming in (weatherstrip foam). Cut a large hole in the back and install a gang of "breeze box" fans (2, 3, or 4?) "stacked" in series. Wet clothes hung on hangars, close the door and seal the box, turn the fans on. You'll get a partial vacuum, perhaps enough to dry clothes. I have to wonder if this uses more energy than a conventional dryer.

Or, use a hundred pounds or so of desiccant material, again in a sealed wardrobe- just hang wet clothes up, open the desiccant container, close the airtight cabinet door. Clothes should dry fairly quickly. Keep the desiccant in a tightly sealed container when not used to dry things. Used desiccant can be "restored" by baking at low temp (250) in an oven overnight. Again, I have to wonder if this uses more energy than a conventional dryer. Lacking an "air fluff" feature, wrinkles might be a problem.

I came across this idea after thinking about hooking up a vacuum cleaner to our dryer vent to better draw air through to speed drying. Creating a true vacuum would be difficult, but any amount extra airflow should help. Probably better off using a wet n' dry shop vac than trying it out with the new Dyson.