It is named a Kutusoff Mantle
Kutusoff was a Russian Prince and a great general for his country who died earlier in 1813.
The mantle is described as follows;
Pink or scarlet cloth mantle, trimmed with a broad velvet ribband to correspond, a spenser of the same materials, on sleeve of which is concealed by the folds of the mantle; the collar, which is high and puckered, fastens at the throat with a broach; and a long lappel [sic], which ends in a point, falls considerably over the left shoulder. A Kutusoff hat of pink or scarlet cloth, turned up in front, with a little corner to the right side, ties under the chin, and is finished with aa pink or scarlet feather; a full puffing of lace or net is seen underneath. Plain cambric high dress, and pink or scarlet leather half boots. Its effect upon a tall and graceful figure is amazingly striking and it is for the carriage costume, decidedly the most elegant cloak that we have seen for some seasons back, and does the greatest credit to the tasteful fancy of its inventress, Miss Powell, successor to Mrs Franklin, Piccadilly.
And so we are offered a couple of interesting tidbits, in particular, the name and location of one of the seamstresses to the ton in addition to what I agree is a stunning ensemble.
Until next time, Happy Rambles.