pantalettes

noun[usually plural]2

1. •
   (historical) A form of long underpants with a frill at the bottom of each leg.

   • In the second row of the cavalcade were Francie, Fanny's god-daughter, now thirteen years old and already elegant in long frilled pantalettes, tartan skirts, and a leghorn hat with streamers, […] — 1929
2. •
   (historical) A removable kind of ruffle worn at the feet of women's drawers.