Hi, thank you for your interest! Our product is made of 100% polyester material and has a regular fit, wide-leg pattern. Therefore, you can choose the size you usually use daily. However, I cannot give clear information about whether the product is see-through or not. Customer reviews may give you more info on this. Additionally, the model's measurements are: Height: 1.80 cm, Chest: 80 cm, Waist: 60 cm, Hips: 89 cm and her size is S. Based on this information, it may be beneficial to choose the size closest to your own measurements. We wish you good shopping!