Thank you for your interest � � It may not be healthy to recommend a clear size based on weight alone, because height, chest, waist and hip measurements are also very effective. This product features: - Model: 54 kg / 170 cm - Model is wearing size: S/36 - Fit: Regular (neither too tight nor too loose) Since you weigh 86 kg, sizes M, L, or larger are generally a better fit. However, we kindly ask you to compare the size options on the product page and the size chart, if available, with your own bust, waist and hip measurements. If only S/M size option appears, it may be too tight for 86 kg. You can examine the size options and comments in detail on Trendyol to ensure a perfect fit for your body. � �