A black-tie optional event is less formal than a black-tie event, so a dark suit and tie is the most appropriate attire. A tuxedo is also acceptable, but not required.

A tailcoat is the most formal type of men's formal attire and is traditionally worn at white-tie events. A tuxedo is also acceptable, but less formal.

A floor-length gown is the most formal type of women's formal attire and is traditionally worn at black-tie events. A cocktail dress is also acceptable, but less formal.

A morning suit is the traditional formal attire for men at a morning wedding. It consists of a tailcoat, waistcoat, and trousers in a light color, such as gray or beige.

A cocktail dress is the most appropriate formal attire for women at a daytime wedding. It should be knee-length or shorter and made of a lightweight fabric, such as silk or chiffon.

A seersucker suit is the traditional formal attire for men at a garden party. It is made of a lightweight cotton fabric with a puckered texture and is typically worn in light colors, such as blue or pink.

A sundress is the most appropriate formal attire for women at a garden party. It should be made of a lightweight fabric, such as cotton or linen, and should be knee-length or shorter.

A dark suit and tie is the traditional formal attire for men at a cocktail party. A tuxedo is also acceptable, but less formal.

A cocktail dress is the most appropriate formal attire for women at a cocktail party. It should be knee-length or shorter and made of a lightweight fabric, such as silk or chiffon.

A dark suit and tie is the traditional formal attire for men at a business dinner. A tuxedo is also acceptable, but less formal.

A pantsuit is the most appropriate formal attire for women at a business dinner. It should be made of a dark-colored fabric, such as black or navy, and should be tailored to fit well.

A dark suit and tie is the traditional formal attire for men at a graduation ceremony. A tuxedo is also acceptable, but less formal.

A skirt and blouse is the most appropriate formal attire for women at a graduation ceremony. The skirt should be knee-length or longer and the blouse should be modest and tailored.

A dark suit and tie is the traditional formal attire for men at a funeral. A tuxedo is also acceptable, but less formal.

A skirt and blouse is the most appropriate formal attire for women at a funeral. The skirt should be knee-length or longer and the blouse should be modest and tailored.