The glen check pattern lends itself a bit better to the single breasted jacket than it does to a DB, in my opinion, but in the photo its done about as well as can be by our usual subject, Luca di Montezemolo, who has paired it with a blue shirt and dark knit necktie.
The 20th century kings of England wore a lot of glen check, always flannel (like Montezemolo's suit), and always single breasted. The pattern is a lovely intermediate, falling as it does between cloths meant exclusively for city streets and those meant only for country hillsides. It's not worn for business in England, though it is in the US. But it's just about perfect for a trip to the Ferrari pits on race day.