WordNet sense 1 (having or covered with or abounding in plumes):

plumy

WordNet sense 2 (having an ornamental plume or feathery tuft):

plumose, plumate

WordNet sense 3 (having or covered with feathers or plumage):

feathered

WordNet sense 4 ((of a knight's helmet) having a decorative plume):

crested

WordNet sense 5 (provided with something intended to increase its beauty or distinction):

adorned, decorated