The Collaborative International Dictionary of English v.0.48:

Tammy \Tam"my\, n.; pl. Tammies.
   1. A kind of woolen, or woolen and cotton, cloth, often
      highly glazed, -- used for curtains, sieves, strainers,
      etc.
      [1913 Webster]

   2. A sieve, or strainer, made of this material; a tamis.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tammy
    n 1: plain-woven (often glazed) fabric of wool or wool and
         cotton used especially formerly for linings and garments
         and curtains
    2: a woolen cap of Scottish origin [syn: tam,
       tam-o'-shanter, tammy]