I've got an another Reverso, the chronograph retrograde, and my feeling is that the 1948 as more casual, specially with a blue or a brown strap. I think it's due to the size of the case (very long) and the very light dial that makes it look bigger than real. The result is a nearly sporty Reverso.
But, it's still a rectangular watch and if I have no problem wearing it with a denim, I wouldn't wear it with a t-shirt and a short. It's not a Squadra on a rubber strap. ;-)