The Sienna DressThe perfect blend between feminine and sophisticated. The model is wearing a small. How to measure the Sienna Dress: 1. The measurements on the size chart are done in centimeters (cm). 2. In order to measure the bust make sure you measure at the fullest part of your bust. You need to place the tape under your arms and measure it across your body over the shoulder blades. 3. In order to measure your waist make sure you measure at the middle part of