The Collaborative International Dictionary of English v.0.48:

Rochet \Roch"et\, n. [Probably corrupted fr. F. rouget the red
   gurnet, from rouge red. CF. Rouge.] (Zool.)
   The red gurnard, or gurnet. See Gurnard.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rochet \Roch"et\, n. [F., dim. fr. OHG. rocch coat, G. rock.]
   1. (Eccl.) A linen garment resembling the surplise, but with
      narrower sleeves, also without sleeves, worn by bishops,
      and by some other ecclesiastical dignitaries, in certain
      religious ceremonies.
      [1913 Webster]

            They see no difference between an idler with a hat
            and national cockade, and an idler in a cowl or in a
            rochet.                               --Burke.
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   2. A frock or outer garment worn in the thirteenth and
      fourteenth centuries. [Obs.] --Rom. of R.
      [1913 Webster]