Hello! Thank you for contacting us. According to the height and weight measurements (165 cm, 63 kg) you gave for our model **Men's Anthracite Knitwear T-shirt 5684 (ID: 322002447)**, we recommend the **S (Small)** body size. Thanks to the elasticity of the knitwear piece, the S body size will sit on you perfectly and ideally. If you want the t-shirt to look a little more comfortable and loose on you, you can also consider the **M (Medium)** size. We wish you pleasant and quality shopping! Madmext Team