For accurate measurement for knitwear, we suggest you measure around the fullest part, place the tape measure under the arms and ensure the tape is flat across the back. You can always ask for assistance if you need it. Alternatively, you can pop into our store and get one of our stylist consultants to help you. Once you have your chest measurement, you can use our knitwear size guide to purchase the correct size. Please note that our size charts only relates to Harvie and Hudson own brand clothing. It may differ to other brands.