And "Rosy Fair" isn't in itself a meaningful formulation, is it? I mean, what, precisely, is a "rosy fair" which her/his face/cheeks/lips is/are like? A flower market? Scarcely makes sense, does it? So surely the words must be a corruption of something? So why not Spenser's 'redde rose medled with the White yfere'? as well as anything else with roses & (homonyms of) fair in?