but any that don't rest on top of the chest will disappear inside the sim *any necklaces or tops or hair with parts that rest on the upper chest of the boobs will rise over them and glitch a bit as u scale them bigger you CAN still wear necklaces. get ready for any flat chested sims to walk around with just a little bit more umph.
these DO make your newly added sims in cas and townie + NPC sims boobs slightly bigger by default because it is a default replacement slider.