The scowling young woman in this carte de visite, identified as Emma Holmann, wears a plaid, off-the-shoulder party dress with the wide skirt typical of the 1860s.
The Coss & Boteler partnership may have been brief: Ross Kelbaugh dates their studio at 93 Baltimore Street to ca. 1862. Coss appears in Maryland IRS tax assessment lists for 1862 as G. M. Coss, 93 Baltimore Street, photographer. In 1863 and 1864, the listing becomes Coss & Leach, now located at 159 West Baltimore.