Definition of "nittie"

Rich people haue the world at will, / Trades fade, but Lawiers flourish still, / Iacke would be married unto Gyll; / but care will kill a Cat. / Are you there, Sirrah, with your beares? / A Barbers shop with the nittie haires, / Doll, Phillis hath lost both her eares / for coozning.

c. 1620, An Excellent New Medley: To the Tune of the Spanish Pauin, [London]: [s.n.]; republished as Charles Hindley, editor, The Roxburghe Ballads, volume I, London: Reeves and Turner, […], 1873, page 79

Next night, therefore, these nittie haxters intend with strong hand to breake his glass-window's, or at dead-time of night to pull downe his signe: and so ends their faire quarrel.

1631, [Richard Brathwait], “A Ruffian”, in Whimzies: Or, a Nevv Cast of Characters, London: Imprinted by F[elix] K[ingston] and are to be sold by Ambrose Rithirdon […]; republished as James O[rchard] Halliwell, editor, The Whimzies; or A New Cast of Characters: From the Original Edition, Published in 1631, London: Printed by Thomas Richards, […], 1859, pages 83–84