Hello, First of all, thank you for your interest. You stated that you are 165 cm tall, 66 kilos, and have a curvy body structure. In this case, the size **L or XL** may be suitable for our product, the Black Wide Leg Women's Sweatpants MG2279. However, thanks to its wide leg and flexible structure, these sweatpants do not hug the body, but offer comfortable use. Depending on your hip size, if you want to make a more comfortable choice, size XL will be more comfortable. In order to recommend you the most suitable size, unfortunately, I cannot give you a clear answer according to the size chart on the product label, but I can tell you that size L is suitable for most people based on our overall customer experience. I would wait again if you have any questions. I wish you good shopping. Best regards, Deniz Madmext Team