Doesnt Vicki have a "nipple gone" morph? Check the dials on the collar bodyparts. I know Ive got such a morph dial but it may be a freebie or a Victoria 2 only morph. You don`t have to use it at full, just enough to stop the peek. As for stretching the suit you could use a magnet and save the result as a morph. The most expensive way of doing it is to buy the morphing catsuit from Daz which has nipple- sizing morphs built in.