I'm 5ft 8 exactly and I was a size 14 at that weight. Mind you, as someone has already said, I depends on your individual shape and also where you shop. I'm a 10/ 12 now in most places but some shops come up so damn small (such as Primark) that I would still be a bigger size in their clothes.
Good luck and well done so far! You've done really well
Debs xx