Carol and Anne make the point that dressing to your body shape is secondary to the 5 elements of DYT: color, design lines, fabrication, texture and pattern. So if you dress in those elements for your type, your body shape is less problematic. One thing to highlight is what design lines mean: essentially the shapes of your clothing should support your movement.
The Science of Personal Dress
Irenee Riter's system is based so much on body shape that the types are referred to by their core shape.