The Collaborative International Dictionary of English v.0.48:

Bloomer \Bloom"er\, n. [From Mrs. Bloomer, an American, who
   sought to introduce this style of dress.]
   1. A costume for women, consisting of a short dress, with
      loose trousers gathered round ankles, and (commonly) a
      broad-brimmed hat.
      [1913 Webster]

   2. A woman who wears a Bloomer costume.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bloomer
    n 1: a flower that blooms in a particular way; "a night bloomer"
    2: an embarrassing mistake [syn: blunder, blooper,
       bloomer, bungle, pratfall, foul-up, fuckup, flub,
       botch, boner, boo-boo]

U.S. Gazetteer Places (2000):

Bloomer, WI -- U.S. city in Wisconsin
   Population (2000):    3347
   Housing Units (2000): 1487
   Land area (2000):     2.686122 sq. miles (6.957023 sq. km)
   Water area (2000):    0.059718 sq. miles (0.154668 sq. km)
   Total area (2000):    2.745840 sq. miles (7.111691 sq. km)
   FIPS code:            08225
   Located within:       Wisconsin (WI), FIPS 55
   Location:             45.102171 N, 91.491767 W
   ZIP Codes (1990):     54724
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Bloomer, WI
    Bloomer