The Collaborative International Dictionary of English v.0.48:

manginess \man"gi*ness\, n. [From Mangy.]
   The condition or quality of being mangy.
   [1913 Webster]

WordNet (r) 3.0 (2006):

manginess
    n 1: a lack of elegance as a consequence of wearing threadbare
         or dirty clothing [syn: shabbiness, seediness,
         manginess, sleaziness]