Not to contradict you nor the advert but I would say that this illustration is a Kenmore not a Montrose, due to the "wings" that fall just above the hips. Or I can respectfully say that in modern times (2013) that. I also look to HRH Prince Charles who's favorite evening Highland Dress Jacket is a green velvet Kenmore and it looks just like the one in the advertisement.
Cheers, Wil