The Collaborative International Dictionary of English v.0.48:

frilly \frilly\ adj.
   Having decorative ruffles or frills.

   Syn: frilled, ruffled.
        [WordNet 1.5]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "frilly":
   arabesque, baroque, brave, bravura, braw, busy, chichi, daring,
   dashing, dressy, elaborate, elegant, exhibitionistic, fancy, fine,
   flamboyant, flashing, flashy, flaunting, florid, flowery, frothy,
   fussy, gallant, gay, glittering, high-wrought, jaunty, jazzy,
   labored, luxuriant, luxurious, moresque, ornate, ostentatious,
   overelaborate, overelegant, overlabored, overworked, overwrought,
   picturesque, pretty-pretty, rakish, rich, rococo, showy, snazzy,
   splashy, splurgy, sporty