From a-l-ancien-regime.tumblr.com/post/26137610033/thomas-gainsborough-mrs-edmund-morton-pleydell.
This close up shows the pointed front and expanded back of Mrs. Morton Plydell's cap.
Keywords: 1765, Gainsborough, Elizabetha Margaretta Richards, Richards family, Morton Pleydell family, British, straight coiffure, cap, lace, choker neck band, neckerchief