Fabricluvr, I would try the pieces......around the neck, around the wasit, and the ties. Having just made my mom several aprons for her birthday, I think you'll be able to tell by trying them around your neck.
If they are all the same width and length...it won't make much difference where you place the pieces.
Good Luck, I'm sure you'll get an answer from Ms. Mumm.
Happy Quilting,
Sharon