Been hearing great things about their jeggings. The picture of a rake thin model on the site says she wears a 12, so are they small and I should size up? I am a 12 in M and S jeggings and a 14-16 elsewhere! Also they don't do multiple length. I usually wear sort of large petite range trousers or small normal range, iyswim. 30 inch leg. Would they be too long?