As documented on my previous post on unillustrated overcoats, , the original button regime before 1864 corresponded to the number of buttons on the undress coat which varied by officer rank and type, in 1864 it was somewhat standardized to 7 (actually corresponding to the frock), and in 1866 until 1886 it was fully standardized to 5 (pairs), but all equally spaced unlike the modern overcoat sometimes called a bridge coat
Some of them even have detachable sleeves so that you can switch up your look between the ceremony and reception
Details: Sheer lace side panels, exposed boning, lace-up back, built-in cups, high slit on skirt
While many elements are shared, each region has its own distinct styles, colors and meanings tied to social status, age and occasion
All you really need is good oil, an acid, some seasoning, and a jar