The Collaborative International Dictionary of English v.0.48:

buttoned \buttoned\ adj.
   furnished with buttons or something buttonlike. Opposite of
   unbuttoned. [Narrower terms: botonee, botonnee;
   button-down; closed]
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Button \But"ton\, v. t. [imp. & p. p. Buttoned; p. pr. & vb.
   n. Buttoning.] [OE. botonen, OF. botoner, F. boutonner. See
   Button, n.]
   1. To fasten with a button or buttons; to inclose or make
      secure with buttons; -- often followed by up.
      [1913 Webster]

            He was a tall, fat, long-bodied man, buttoned up to
            the throat in a tight green coat.     --Dickens.
      [1913 Webster]

   2. To dress or clothe. [Obs.] --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

buttoned
    adj 1: furnished or closed with buttons or something buttonlike
           [syn: buttoned, fastened] [ant: unbuttoned,
           unfastened]