I’ve got this idea for a tattoo. I’m going to get grid of fine lines all over my body so I can track how my body contour changes as I grow fat and old. (Question: should I get my cock tattooed when hard or flaccid? Or maybe soft but stretched?)
That will track changes, but what if you just want to see the existing distortion of a body, say the sexual swellings of a thick booty or the sagging curves of enormous breasts? In that case we can apply an externally supplied grid of knit mesh:

THICK BOOTY (via not safe for work)

ENORMOUS BREASTS (via not safe for work)
Noticed the distortion of the grid as the girl flesh pushes against the knit. A more mathematically inclined pervert could model the distortion to calculate real world metrics, maybe a mesh-spacing bra-size calculator.
But even mesh has its limits. Stretched too far it gives no clues as to the size of the wrapped object. Luckily that normally means it’s exceptionally huge, like this talented ass for example:

MAD SKILLZ (via mr. mcnasty)
[...] More mesh: [...]