The term that describes the overall shape or silhouette of a hairstyle is "form." In hairstyling, form refers to the three-dimensional shape and silhouette that is created by the arrangement of the hair. It encompasses how the hair falls and behaves, creating the overall appearance of the hairstyle. Recognizing the form of a hairstyle is essential for hairstylists as it helps them in creating balanced and harmonious looks that complement the client's face shape and features.
Texture refers to the feel and appearance of the hair, such as whether it is coarse, fine, straight, or curly. Volume describes the amount of space the hair occupies, which can be manipulated to make hair appear fuller or flatter but does not define the hair's shape. Style pertains to the design and setup of the hair, including elements like curls, braids, or straightening, but again does not directly refer to the silhouette itself. Therefore, "form" is the most accurate term for describing the overall shape of a hairstyle.