The Collaborative International Dictionary of English v.0.48:

Don \Don\, v. t. [imp. & p. p. Donned; p. pr. & vb. n.
   Donning.] [Do + on; -- opposed to doff. See Do, v. t.,
   7.]
   To put on; to dress in; to invest one's self with.
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         Should I don this robe and trouble you.  --Shak.
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         At night, or in the rain,
         He dons a surcoat which he doffs at morn. --Emerson.
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