Wow! Now that I look, there are a lot of different body shape theories out there:

You Look Fab (pretty pear, hot hourglass, adorable apple, statuesque inverted triangle and racy rectangle)

Inside Out Style by Imogen Lamport



Or these books:
- Pocket Stylist by Kendall Farr
- The Science of Sexy by Bradley Bayou
- Flatter your Figure by Jane Larkey
- What Not to Wear books – Stacy London and Clinton Kelly