Hello, When we evaluate your height and weight information, if you are 168 cm tall and weigh 59 kg, size S may be suitable for you, whether you want it to be tight or fit perfectly. The product is produced in a standard mold and since you stated that your body is a little skinny, size S can provide the fit you want. We recommend you consider size M, this size will offer a slightly more relaxed fit but will not be too baggy. If your preference is for a tight or snug fit, you can choose size S. We wish you pleasant shopping.