The Collaborative International Dictionary of English v.0.48:

Become \Be*come"\, v. i. [imp. Became; p. p. Become; p. pr.
   & vb. n. Becoming.] [OE. bicumen, becumen, AS. becuman to
   come to, to happen; akin to D. bekomen, OHG.a piqu["e]man,
   Goth. biquiman to come upon, G. bekommen to get, suit. See
   Be-, and Come.]
   1. To pass from one state to another; to enter into some
      state or condition, by a change from another state, or by
      assuming or receiving new properties or qualities,
      additional matter, or a new character.
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            The Lord God . . . breathed into his nostrils the
            breath of life; and man became a living soul. --Gen.
                                                  ii. 7.
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            That error now which is become my crime. --Milton.
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   2. To come; to get. [Obs.]
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            But, madam, where is Warwick then become! --Shak.
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   To become of, to be the present state or place of; to be
      the fate of; to be the end of; to be the final or
      subsequent condition of.
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            What is then become of so huge a multitude? --Sir W.
                                                  Raleigh.
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The Collaborative International Dictionary of English v.0.48:

Becoming \Be*com"ing\, n.
   That which is becoming or appropriate. [Obs.]
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The Collaborative International Dictionary of English v.0.48:

Becoming \Be*com"ing\, a.
   Appropriate or fit; congruous; suitable; graceful; befitting.
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         A low and becoming tone.                 --Thackeray.
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   Note: Formerly sometimes followed by of.
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               Such discourses as are becoming of them.
                                                  --Dryden.
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   Syn: Seemly; comely; decorous; decent; proper.
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WordNet (r) 3.0 (2006):

becoming
    adj 1: according with custom or propriety; "her becoming
           modesty"; "comely behavior"; "it is not comme il faut for
           a gentleman to be constantly asking for money"; "a decent
           burial"; "seemly behavior" [syn: becoming, comely,
           comme il faut, decent, decorous, seemly]
    2: displaying or setting off to best advantage; "a becoming new
       shade of rose"; "a becoming portrait"