Just like the title says, I found a few kinks that need to be ironed out.
1) While you can buy the stuff the secret vendors sell, you can't use them. Neither the potions nor the trinkets appear anywhere at home nor in the shops.
2) I think the math might be a bit off for the measurements, considering that Jade's starting size puts her somewhere around 5'7'' and about 200lbs in weight For a woman, these are by no means something you can really consider small, and they increase very quickly.
3) While you can purchase new clothes at the mall, they don't really do anything visual. I would recommend putting a notice in game in the store that they don't do anything yet.