Hello, first of all, we would like to state that you have chosen a great product! Our **Fuchsia Adjustable Waist Wide Leg Flowy Striped Pants MG2087** model has a flowy and very comfortable pattern due to its structure. According to your measurements of 1.72 height and 54 kilos, size S will normally suit you. However, if you're aiming for a more relaxed, flowy, and oversized look, you can confidently choose **size M** as our product features an adjustable waist. Thanks to the adjustable waist feature, you can narrow the waist part according to yourself, thus you can achieve the extra casual atmosphere you are looking for in the leg and hip stance. We wish you pleasant shopping! **Madmext Team**