J.B., perhaps you got the idea of a shorter length from knowing that there was a period when German jackets tended to be quite short - in the early 30s.
Another trouser pattern for strollers is the glencheck, properly in black-and-white with no colored overcheck in it.
The jacket ideally has welted (unflapped) pockets, and the trousers for strollers are properly uncuffed, although Esquire mentions the short-lived appearance of cuffed trousers in the early/mid 30s.
The pattern of the famous "striped pants" for formal and informal daywear is called cashmere stripe, by the way. There must have been more than 100 or 200 different patterns for cashmere stripes alone.
The DB stroller is a nice way of wearing informal daywear without standing out as much as the SB variety with waistcoat would do.
You mean this one, TT?
Oh, and there are a few strollers in Section V: Formal and semi-formal, both day and evening of the Esquire thread.