The one style of trousers that people never talk about is the darted front. We always hear about pleats versus no pleats, but darts are left out. A dart is essentially a pleat that is sewn shut, but it’s not very noticeable. All trousers have darts in the rear, one or two on each side over the pocket—or over where the pocket would be if there is none. For medium to high rise trousers, a dart in the front is better than a plain front so the trousers can better curve over the hips. Only high-end ready-to-wear brands and bespoke tailors seem to appreciate the effectiveness of darts in the front of trousers
Trouser darts in front are not as deep as trouser pleats are, and there is only one on each side instead of two. Though darts don’t provide extra cloth for the trousers to expand when sitting like pleats do, they help curve the trousers over the hips. They also can help the problem of side pockets that flare out on flat front trousers. Some tailors place the dart where the main pleat would be on pleated trousers, and some place it less noticeably off to the side. I cannot say in which place the dart is more effective. Can you still call trousers with a dart in front “flat front”? Maybe. With a dart the front is no longer flat, it is curved.
I have most certainly labelled some darted trousers as flat front because it’s difficult to see darts on screen. Now that I have the series on Blu-ray, I can better see those kinds of details. but not in every example. It appears that George Lazenby’s dinner suit trousers have darts, but those are the only suit trousers we see without a jacket. All of Roger Moore’s Cyril Castle—the tailor who made Roger Moore’s suits in Live and Let Die and The Man with the Golden Gun—trousers have darts, which are in-line with the trouser crease. Castle gives Moore’s trousers very long front darts, which most likely assist the fit at the expense of a clean look. Darts, however, look cleaner than pleats. Pierce Brosnan’s and Daniel Craig’s Brioni trousers that don’t have pleats have darts, and Brioni places them closer to the side pocket. Anthony Sinclair made his darts the same way for Sean Connery in Diamonds Are Forever.