From the museum's Web site.
Mary bundles and clasps her wrap around her right shoulder like a leg-o-mutton sleeve. The bodice is tight-fitting - not pouter pigeon or blouson.
Keywords: 1902, Sargent, Mary Crowninshield Endicott, Mary Crowninshield Endicott Chamberlain, Mrs. Joseph Chamberlain, Endicott family, Chamberlain family, British, wavy coiffure, bun, headdress, fichu, vee neckline, wrap, elbow length leg-o-mutton sleeves, clasps, fitted bodice, scoop décolletage, elbow length sleeves, flared cuffs, down turned waistline, close skirt, gloves, folding fan