I've been working on this for 4 months with no headway yet.
User comes in to site and can browse by either graphic design OR style of shirt.
If they start by browsing graphic design, then I want to forward them to "style" after they choose a design and vice versa for browsing by style first. The checkout page should include a design and a shirt style together.
Choose a design > Choose a shirt style > checkout!
Choose a shirt style > Choose a design > checkout!
Why is this so darned difficult?