the peaked lapel (american english), peak lapel, or pointed lapel (british english), is the most formal, featuring on double-breasted jackets, all formal coats such as a tailcoat or morning coat, and also commonly with a tuxedo (both single and double breasted). in the late 1920s and 1930s, the single breasted peaked lapel jacket was considered a very stylish design. the feature was carried into day clothing by the increasing popularity of the peaked dinner jacket. the ability to cut peak lapels properly on a single-breasted suit is one of the most challenging tailoring tasks, even for very experienced tailors.