You get 12 accessory points total I think. Each peice ive see so far has been worth 2 slots. so you can have 6 2 slot items in that case.
Which sort of brings up an interesting question. Will there be accessories that take up more/less slots? Otherwise, I don't see a point in having each piece take up 2 points. They could have just halved it to 6 and have each piece take up 1 point.
So, assuming there will be variable costs for accessories, I wonder if better gear will require more or less points to equip.