Usually a 16 in Lucy & Yak trousers, or 16-18 else wear do to wide hips and thicker thighs, however I actually sized down to to a 14 in these and they fit perfectly!!! Extremely flattering and sit perfectly on my waist and the legs don’t look too oversized. However I’m 5’4 and though they fit my height and size perfectly, I imagine the crotch area would run fairly short on anyone much higher.