I am also 160cm short, I don't generally weigh myself but at last check I was about 70kg. I'm 12-14 on the bottom, and about an 8-10 on top - the sucky part is that it goes to the bigger size at my hips, so small tops fit me from the waist up but are too tight on my hips, and big tops fit my hips but swim on my bust/shoulders/etc
damn being a pear! It generally differs from shop to shop, but I agree that a size 12 in target is generally around a 14 in shops like Temt. It's interesting how much sizes differ for people who weigh the same!!