The over-frock, like other body coats, could not survive the increasing cost of the bespoke tailoring required to make them fit properly around the waist to create the classical "hour-glass" silhouette.
The over-frock, comparable to other coats, could not thrive due to the escalating cost of high-end tailoring needed to create a tailored fit around the waist and produce the iconic "hour-glass" shape.