You will need the Ju_Beos_collar mesh from
here and the barbie bodybuilder bottom mesh from
here for these to work in your game.
Here are 8 skins linked to the barbie bodybuilder with 2 pierced nipples and a collar.
Credits:
Meshes - Marvine and Beosboxboy
Textures - Beosboxboy
Skin linking tutorial - Marvine
Feel free to re-distribute and re-colour as you like with the exception that they cannot be uploaded/posted on any paysite or the Maxis exchange and please credit Marvine, Beosboxboy and wirelessguy (in that order).