The Collaborative International Dictionary of English v.0.48:

Modish \Mod"ish\, a.
   According to the mode, or customary manner; conformed to the
   fashion; fashionable; hence, conventional; as, a modish
   dress; a modish feast. --Dryden. "Modish forms of address."
   --Barrow.
   [1913 Webster] -- Mod"ish*ly, adv. -- Mod"ish*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

modish
    adj 1: in the current fashion or style [syn: latest, a la
           mode(p), in style(p), in vogue(p), modish]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "modish":
   a la mode, advanced, avant-garde, chic, contemporary, dashing,
   dressed to advantage, dressed up, en grande tenue, endimanche,
   exclusive, far out, fashionable, forward-looking, gussied up, in,
   in full dress, in full feather, in high feather, in tails,
   in the mode, mod, modern, modernistic, modernized, newfashioned,
   now, present-day, present-time, progressive, slicked up, smart,
   soigne, soignee, spruce, streamlined, stylish, swank, swish,
   trendy, twentieth-century, ultra-ultra, ultramodern, up-to-date,
   up-to-datish, up-to-the-minute, vogue, voguish, way out,
   well turned-out, well-dressed, with-it