I suspect they're wearing the same boots under the breeches. I've seen these a few times. Maybe they were meant for situations where the flexibility of jodhpurs was needed but with less chance of wearing or riding up like on horseback. Motoring, motorcycling, rambling, etc?
Monocle: This may be worn by (1) good dukes, (2) all Englishmen. No bad man may wear a monocle. ~P. G. Wodehouse
Me personally donīt like the whole system of enlarging the patterns from those small cards to the needed size... but the plus against the ordinary one-size-vintage patterns is that it is a multisize system. I have two complete sets/ books from it and I mostly use them as a reference for shapes/ designs of collars, pockets and such.