During the Regency, ladies and gentlemen of the ton went to Hyde Park throughout the Season between the fashionable hours of 5:00 and 6:00 in the afternoon to see and be seen. Wearing a fetching ensemble was one way to help a lady catch the eye of a potential suitor. If all else failed, she could “accidentally” fall into the Serpentine.
Description under fashion print, translated from French to English:
“Straw bonnet has folettes and nodes of cornflowers. Canezou [a type of Spencer] made of muslin. Dress made of percale with ribbons and tulle.”
Source: Observateur des Modes, No. 58, 1819-1823
Laurie Benson's Cozy Drawing Room 