I bought this jumper today: www.stories.com/en_gbp/clothing/knitwear/sweaters/product.mock-neck-sweater-purple.1008611006.html
I asked in the shop what size a medium was and the woman said a 12. I tried it on and bought the jumper. It was a bit roomy but I thought that was just the style. I've just looked at the size guide on their website and it says medium is 14-16! What size do you buy if you're a 12? I want to take it back now but the train fair to get to the store is £20.