Polly Flinders was a brand name of children's clothing, popular in the 1960s and 1970s, and known for their hand-smocking. In the 1980s, Polly Flinders was operated by Baylis Brothers, a division of U.S. Industries. These dresses were available at major chain outlets, including Sears.
Poly Flinders is also the name of a child referenced in a 19th-century British nursery rhyme.
References
Polly Flinders Wikipedia(Text) CC BY-SA