Hello dear customer, Thank you for your interest. Our product is in a regular fit pattern, so you can generally prefer the size you use in daily life. But due to everyone has different shoulder, chest and waist, so sorry we can't give a clear size information. Since the model's measurements are not specified by the manufacturer, we cannot make a definitive conclusion on this issue, sir. We kindly ask you to review the comments made by customers who purchased the product regarding the size and, if there is a size chart, to review it. In this way, you can choose the size closest to your own measurements in a healthier way.