I used to sew for the public. Lots of wedding dresses, bridesmaid dressses... The dress forms really don't adjust well for multiple people. Full breast measurements are rarely the same distance from the waistline, or the waistline from the hips on any two people. The forms are at set positions.
Mine was a poor representation of my own body. About the only thing the dress form was good for, was hanging a dress a couple days prior to hemming to get the bias potions settled so the finished hem would be level to the floor... but placement of the hem must be marked while on the person, not the form, as the customer may have a bigger but, or uneven hips, or many other irregularities. Hanging can be done just as well on a hanger.
One day I will be making one of those duct tape forms of myself like this.
Now those are useful!