Kanon shapes for women are created with an eye towards beautiful, realistic proportions. The shapes are made to be worn with mesh bodies and the style notes indicate which body a shape was created for. Shapes can be worn with other mesh bodies or without a mesh body, but the result may not be ideal.
Some shapes are also made specifically for particular Bento-enabled mesh heads. The style notes will note when this is the case. Shapes made for Bento-enabled mesh heads are very unlikely work with other mesh heads or without any mesh head at all.