Source : Webster's Revised Unabridged Dictionary (1913)

Stylish \Styl"ish\, a.
   Having style or artistic quality; given to, or fond of, the
   display of style; highly fashionable; modish; as, a stylish
   dress, house, manner. -- {Styl"ish*ly}, adv. --
   {Styl"ish*ness}, n.

Source : WordNet®

stylishness
     n : elegance by virtue of being fashionable [syn: {chic}, {chicness},
          {modishness}, {smartness}, {swank}, {last word}]