You can try out these sliders from Mod The Sims. Be sure to read through everything at MTS.
I ended up testing these a little while ago and they work great for me:)
-Breast size (female teen-elder)
-Waist size (all ages and genders)
-Hip size/pelvis width (all ages and genders)
-Butt Size (all genders, teen-elder)
-Head Size (all ages and genders)