Brewer's: Jenny Wren
the sweetheart of Robin Redbreast.
Robin promised Jenny, if she would be his wife, she should `feed on cherry-pie and drink currant-wine'; and he says: `Ill dress you like a goldfinch, Or any peacock gay; So, dearest Jen, if you'll be mine, Let us appoint the day.' Jenny replies: `Cherry-pie is very nice, And so is current wine; But I must wear my plain brown gown, And never go too fine.'
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894