A body shape is a set of meshes that create Sims with different bodies than the original. They usually include one model to be used by the Sim when nude (as in the shower) and many sets to be used when wearing clothes.
The body shapes modify the standard Maxis shape in those ways:
- They can be more (or less) muscular
- They can be fatter (or thinner) than Maxis default
- They can have different breast or hip sizes
- They can have anatomically correct parts that the psychoes at Maxis mutilated from the human body
- They can be alien bodies (mermaids, satyrs, etc)
Classic Pinup (or CPU) is probably the most famous body shape. Created by Warlook, there are many skins and clothes. It's only available for Female Adult (and those that use the same mesh: Young Adult and Elder).
Neanderthal was created by BlooM, based on Maxis bigfoot. It's only available for Male Adult (and those that use the same mesh: Young Adult and Elder)