1880-90.The frock coat, for example, once considered appropriate anywhere before six in the evening gradually became formal daytime attire by the 1880s The grey frock coat would have been considered correct dress for a promenade in the park. Black or navy was deemed appropriate for more formal activities.
Men's dress coat, 1801-1828. Swallow tail coat, made of navy wool, facecloth with plush dark blue velvet collar. This coat is double brested, and with tails. The coat is combined in this image with breeches of beige colour. Museum of London.