I'm not sure about the size, but I usually wear L, and this fits me loosely, so I'm listing it as L. The width is 57 cm when laid flat. The colors look vibrant in the photos, but they are actually more subdued. They always photograph better than they look in person. Thank you for your understanding. The front is unlined and see-through. It feels cool because the neckline is wide both in the front and back, but I couldn't quite pull it off, so I've had it for a few years. I hope someone will wear it.