3 Piece Luggage refers to any matching set of travel containers with 3 pieces. These types of pieces include suitcases, carry-on bags, duffel bags, and tote bags. These pieces vary in size and shape to be used for any occasion. Many types of luggage have wheels as an added convenience.
Sets refers to any type of articles of clothing or group of things which are considered to be of the same kind and that can be paired together and are so used. Layettes are one example of a group or set of articles of clothing.