I thought these 3 pictures were really interesting - so I thought I would share them for inspiration.
Horezontal lapel, equal or nearly equal collar to lapel size, everyone wearing boots wiht suits,
Matching flat cap and coat, always a nice touch. Interesting cuff on the blcak coat
A young Winston Churchill in a blue/grey frock coat
I would be ragging if I was the man standing on the left. He forgot to button the middle button.