A strictly vanilla version isn't possible, because the design includes a torso strap. A vanilla torso strap is drawn on the BACK layer, and hence it will be unresponsive to adjustment of the breast slider. As the breasts are increased to medium size, the bra cups will visibly separate from the torso strap during bouncy motion. With large breasts, the cups will be permanently separated from the torso strap -- they won't connect even when the girl is completely at rest.