Both the S/M and L/XL Gownies are all the same length at 95cm from the nape of the neck to the hem, but the L/XL is wider across the bust and through the middle than the S/M. I am a standard 5'2" and they cover my knees but no longer, a great length for coverage when squatting on the ball for example! Measuring across the chest of the S/M it measures 57.5cm, double that for the circumference around the chest area. Measuring across the chest of the L/XL it measures 60cm, double that for the circumference around the chest area. Dont hesitate to contact us for any other sizing info!