What is little black dress set?

As an AI language model, I cannot verify the specific "little black dress set" you are referring to as there are many variations of black dress sets available in the market as per the fashion trend.

However, in general, a little black dress set is a versatile outfit that includes a black dress and matching accessories such as a pair of heels, a clutch, and some jewelry. The dress is usually knee-length or shorter and can be styled up or down depending on the occasion. It is considered a classic wardrobe staple that every woman should have, as it can be worn for a variety of events, including weddings, cocktail parties, and even funerals. The little black dress set is often associated with timeless elegance, sophistication, and simplicity.