https://www.blacktieguide.com/Classic_Components/Warm_Weather.htm
Lapels
While peaked lapels are perfectly acceptable, the more casual effect of the shawl collar is ideally suited to this less formal jacket. Traditionally, the collars are self facing meaning that they are covered in the same fabric as the rest of the jacket.
Fabric
Unlined, lightweight natural fabrics are acceptable alternatives to the standard worsted wool. This includes cotton, gabardine and linen.
Lapels
While peaked lapels are perfectly acceptable, the more casual effect of the shawl collar is ideally suited to this less formal jacket. Traditionally, the collars are self facing meaning that they are covered in the same fabric as the rest of the jacket.
Fabric
Unlined, lightweight natural fabrics are acceptable alternatives to the standard worsted wool. This includes cotton, gabardine and linen.
