In the comments of the original cake pic, the original cake artist states “The skirt is two round 8 × 3” and the torso is RKT. The bottom cakes are 14 x3" and 12 × 3″."
With that comment in mind, I believe there is some sort of support structure used to hold up the dress . . . I would imagine there’s either a wood or metal plate attached to the rod that supports the cake & RKT used for the skirt & torso. In other words, it appears now is the time to brush up on either your carpenter or welding skills. ;-)
Hope that helps.