Air force blue is an often overlooked colour for lounge suits. The color is halfway between medium blue and medium grey, though a similar effect can be achieved by weaving dark blue threads with white threads, as in a pick-and-pick, nailhead or birdseye fabric.
Sean Connery’s air force blue suit from Diamonds Are Forever is two-piece suit by Anthony Sinclair with peak lapels. It was James Bond’s only single-breasted suit in the series with peaked lapels—also known as double-breasted lapels since they originated and are usually found on double-breasted jackets—until the grey linen suit in Casino Royale. Unfortunately, the picture above is all that is seen of this suit. It most likely has a button two front, flapped pockets and double vents like the other suits in the film have. The trousers have a darted front with on-seam side pockets, a left-side coin pocket under the waistband and tapered legs like the other suit trousers in the film have.
Bond wears a cream cotton poplin shirt with a spread collar, front placket and two-button cocktail cuffs from Turnbull & Asser. The tie is solid navy blue tied in a windsor knot, maybe a grenadine tie from Turnbull & Asser.