Always choose the dress form size using the smallest horizontal measurement ranging between your bust and hip line. If your bust, for example, is 34 and your hips are 38, you will need Size 4, as it will match your smallest horizontal measurement. You can always pad up to shape the form. What's the difference between manikin and mannequin? The main difference between Manikin and Mannequin is that the Manikin is a life-sized anatomical human model used in education and Mannequin is a doll or statue used to show clothing in a store. How much do mannequins weigh? And while some of the mannequins weigh up to 50 or 60 pounds, most weigh in at about 25 pounds is kids abstract mannequin. Most mannequins today are made of fiberglass, and the most modern, coated with a dark gray granite spray called Zolatone.