Use 'em all the time to cover street clothes when going into an operating room. For their intended purpose (disposable coveralls) they are fine. For any long term practicality (more than 24 hours), you are better off buying some real coveralls--they just aren't that durable.

Having said the above, I do keep a few around in the truck for keeping clean while changing oil, etc, and for winter use as camoflauge/extra warmth layer (they are white, and do stop the wind).
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein