The term "Johny" is commonly used in northeastern United States and in eastern Canada.
"Medical references, such as Dorland’s and Stedman’s, are split on the subject, with only Stedman’s linking the word with medical wear. “Johnny” as a lowercased noun for such garments also appears in several general dictionaries produced in the United States. And although “johnny” is listed in the Oxford English Dictionary, the ultimate go-to guide for word spelunkers, its slang usages are two—“a man” and “a condom,” with nary a mention of hospital gown."
Source(s):
http://alumnibulletin.med.harvard.edu/bulletin/winter2007/1a.php


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