It's what they were selling well past 1955. Here's the first page of the appearance guidelines in 2014 ...
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"The Disney Look is a classic look that is clean, natural, polished and professional, and avoids 'cutting edge' trends or extreme styles." The story as I understand it is that the entire reason an appearance policy was adopted in the first place was because the Jungle Cruise skippers were getting a little out of control and Walt didn't like one of their long beards. Walt said "clean it up," and they all got haircuts and a shave.