HAHAHAHA. So, in USA, an 18 UK is size 14. Which is the BELOW average size of women (16). HAHAHAH, That is skinny to most people these days. It's so rare to find anyone under a US size 6 (UK 2-4?) unless they are asian, a child, or a unicorn. I am "the skinny one" because I wear US size 4. Uhh, it's totally normal.