Maria, it sounds like you had an extremely successful shopping trip!! All of your outfits sound great! And don't worry about the tum or any other body part - the photog will work their magic & take advantage of all of your great parts!
I agree with Katie - a car calendar would be great, if you can find one of his fav cars that'd be even better, but any cool car calendar would work. You can have it laying open to Sept next to you in a photo w/ your date circled in a heart or something appropriately corny. Or you could buy a mechanic/car magazine & have a pic holding it up in front of you strategically placed, like you're reading it.
Aside from that, it sounds like you actually have enough props. I've seen many bd pics where the girls aren't wearing any jewelry, aside from their E-ring and maybe some earrings. Does the photog have a feather boa? If so you could play with that, but I wouldn't worry about it. You can use furniture & sheets as props too so I would just work with whatever they have.
when's your shoot?