Bernard Lee’s M is known for his likeness to Winston Churchill, partially attributed to his penchance for bow ties. M didn’t wear a bow tie in Dr. No, but he started the tradition in the second film, From Russia With Love. M’s first bow tie is wine red with pale yellow dots, and later in the film wears a very similar bow tie. M’s suit is brown flannel with a red cast. The suit coat has a two-button front with three buttons on the cuffs, flapped pockets and no vents. It actually has a very similar cut to Connery’s suit, with soft shoulders and a swelled chest. The trousers are most likely also the same, with double forward pleats. Though M’s and Bond’s suits are very similar, the difference in their figures is what makes the suits look so much different from each other.
M’s shirt is slightly off-white with a spread collar, double cuffs and a plain front. His shoes are medium brown, quite unusual for office-wear in London, though a man in his position can wear whatever he wants to. M accessorises his suit with a folded white linen handkerchief in the breast pocket. And though it’s not something he wears, the pipe is is a key accessory to the character. Even though there is nothing particularly outdated with his clothes, the pipe, bow tie, flannel cloth and vent-less skirt all contribute to M’s old-world look.
You can see Bond’s blue suit from this scene here.