The Collaborative International Dictionary of English v.0.48:

Challis \Chal"lis\, n. [F. chaly, challis, a stuff made of
   goat's hair.]
   A soft and delicate woolen, or woolen and silk, fabric, for
   ladies' dresses. [Written also chally.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

challis
    n 1: a soft lightweight fabric (usually printed)

U.S. Gazetteer Places (2000):

Challis, ID -- U.S. city in Idaho
   Population (2000):    909
   Housing Units (2000): 525
   Land area (2000):     1.779481 sq. miles (4.608835 sq. km)
   Water area (2000):    0.023415 sq. miles (0.060645 sq. km)
   Total area (2000):    1.802896 sq. miles (4.669480 sq. km)
   FIPS code:            13780
   Located within:       Idaho (ID), FIPS 16
   Location:             44.504260 N, 114.228279 W
   ZIP Codes (1990):     83226
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Challis, ID
    Challis