Sizing varies between styles and in some cases fabrics. Check out our "Size & Fit" link on each product page for a description of the sizing, any model details, and a link to our Size Chart.
We recommend taking a similar item from you closet that fits you well, laying it flat and using a measuring tape to take the same measurements as shown on the size chart. Then compare your measurements to the chart and that should give you enough information to select a size.
If you have any specific sizing or fit questions, please reach out to us via our support chat or email us at service@imperfects.com