All of James Bond’s lounge coats—suit jackets, sports coats and dinner jacket—have a front dart. Darts are folds sewn into the cloth to help provide a three-dimensional shape. The front dart gives fullness to the chest and is used by almost all British and Italian tailors. Almost all suits today have it. Tailoring in the American Ivy League style, like what Cec Linder wears as Felix Leiter in Goldfinger, dispenses with the front dart for a cleaner and straighter look, but it relies on an underarm dart for a little shape. A GQ article from April 1966 says that Sean Connery’s tailor Anthony Sinclair doesn’t use a front dart in patterned cloths, only a side dart. The dart noticeably disrupts a large pattern. Sinclair darted all of Connery’s lounge coats, but Sean Connery’s athletic drop would be difficult to tailor well without a front dart.
All of Bond’s lounge coats from Dr. No through The Man with the Golden Gun feature a front dart that extends from the chest down to the hem. The dart needs to extend to the hem to prevent too much skirt flare. This method of darting isn’t used very much today since the long dart is more disrupting, especially when a pattern is involved. Some tailors only extend the dart to the hem when cutting a jacket with patch pockets since the dart is partially hidden. Anthony Sinclair, Dimi Major and Cyril Castle all cut their lounge coats this way. One tailor that still uses the extended front dart is Napolisumisura in Naples, Italy, but very few others still do. The extended front dart is used in conjunction with an underarm dart.
From The Spy Who Loved Me to now, all of Bond’s front darts extend to only the pocket, where the rest of the dart is displaced horizontally across the pocket and continued down from the bottom of the underarm dart. The effect is still the same as if the dart continued straight down. This creates a separate piece called the side body. There are other methods of cutting coats, but this is the most common. On patch pockets coats you can look inside the pocket to see how the front dart is cut horizontally to be displaced in the side body seam. Displacing the lower part of the dart hides it under the sleeve and makes pattern mismatching less noticeable. Angelo Roma, Douglas Hayward, Brioni and Tom Ford lounge coats are all cut like this. The new Anthony Sinclair suits are also cut in this manner.
For more on the front dart, whether extended straight to the hem or displaced to the side, see The Cutter and Tailor.