From WordNet (r) 3.0 (2006) [wn]:
unbuttoned
adj 1: not buttoned; "the wind picked up the hem of her
unbuttoned coat" [syn: unbuttoned, unfastened] [ant:
buttoned, fastened]
2: not under constraint in action or expression; "this
unbuttoned and disrespectful age"- Curtis Bok; "unlaced
behavior in the neighborhood pub" [syn: unbuttoned,
unlaced]