The classic and the most formal dinner jacket is the single-breasted one button model.
Because it only has one button, the front is cut in a deep V shape, which accentuates the wearer’s torso. The jacket is often worn unbuttoned, meaning that it’s perfectly suited for a stylish cummerbund or waistcoat as a cover for the waistband.
This has made the one button tuxedo particuarly versatile, leading to more playfulness and experimentation in formal wear.
The classic and the most formal dinner jacket is the single-breasted one button model, which molds to the torso and offers unsurpassable versatility.