Many cite the signing of the treaty of Versailles in 1919 as the death knell of the frock coat, as Woodrow Wilson and David Lloyd-George rocked up in majestic morning coats. Description from andrewsandpygott.wordpress.com. I searched for this on bing.com/images
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.