First the Dutch cap again.
The part of this cap that caught my attention was the tightness to the head, in the style of the later 1770s, that generally is not so close and worn a little differently. The layers of frills are also very small and tight. By 1778 caps should be exploding all over the place!
Her cap actually reminds me of the caps of young children, it has a lot in common with this child's cap, English c 1778. I call these, the bathing cap style of the 1950s and 60s. Lots of tight frills, close to the head and face.
Mrs. Izard by Copley (c 1775) is wearing a frilled cap and yet it looks different. It is always about proportions, even small ones make a difference.
|Museum of Fine Arts, Boston|
Mrs. Izard's cap while going over her ears, is set much further back on her head, the frills are not as small and tight and the cap has more curve around the face. Also the ribbon poufs stand out more from the cap, the entire look is different. Mrs. Izards's cap is to my eye more three dimensional than the Dutch cap.
The original comments referenced Mrs. Mifflin, another Copley portrait, c 1773. Mrs. Mifflin is a Quaker, which puts a spin on her cap, something we have to keep in mind.
Her cap while close to the head, just barely touches her ears, and is set far back on her head, away from her face. I have actually patterned this cap for a cap workshop. The cap only looked good on me, no one else ended up making the cap in the workshop. It took a zillion iterations to get the pattern right and I seldom wear it. I have only seen this style in one other portrait, a relative of Mrs. Mifflin, and I can't find it. Will post it when I do, it was on the National Portrait Gallery website or a link from it.