Ok, here’s the list of samples from Ackermann’s. I’ll try to put together a page of screenshots so it makes more sense:

1809 “Wear your French foundling cap, and Vlissengen mob…with your morning dress..” (No image)
1809, November: “A matron mob, or cap of point lace, ornamented with shaded yellow, or lemon-colored ribbons.”
1812, May: “Parisian mob cap, of fine lace confined around the head”
1812, June: “foundling mob cap, composed of lace”
1813, May: Brunswick mob cap, composed of net and Brussels lace”
1814, January:   “Flushing mob cap composed entirely of lace”
1814, April: “Bourdeaux mob cap composed of lace”
1815, February: French mob cap, composed of white satin and blond lace”
1815, April: “mob cap composed of net and Brussels lace”
1815, November: “French mob cap, composed of satin and quilled lace”
1816, July “, “The cornette worn with this dress is of the mob kind,”
1817, January: “a morning cornette, composed of worked (embroidered) muslin; the lower part a mob, cut in a different manner to any we have seen” [Hope: no image! So we may never know what they meant.)
1817 nations “lower part a mob” several more times in the “general” descriptions (I.e. not connected with a specific fashion plate). At this point they seem to move from an accessory for morning dress to an accessory for half-dress, as well as being part of the description of the more elaborate caps known as cornettes. Example: Cornettes of black crape are also worn; they are always of the mob kind, and have the most sombre effect it is possible to conceive. Shall describe to you one of the prettiest, as you might perhaps like to have it made in white crape.” It goes on to describe the most elaborate

By March 1818 we have more description not related to a specific image: Example: “In half dress, the corvette or mob shape is not, however, very fashionable, the most tannish being round…”

In May 1819 there is one of my favorite gowns for morning dress, with a lovely cap: “Head-dress, the Parisian mob. We refer to our print for the form of this elegant cap: it has very small ears, and does not come quite close under the chin; it is ornamented with a garland of exotics.”

The rest in 1819 are only descriptions, no images, as are several in 1820.