Ideally, just wear your regular workout clothes. Try and avoid clothing with metal, such as zippers in jeans. Please note that all clients are required to wear at least one layer of clothing on top of their underwear for the scan. Additionally, for maximum accuracy, you’ll want to do the scan under the same circumstances each time. So if you fast for the first scan, you may want to fast for subsequent scans, so that changes in your body composition are a reflection of actual change, rather than the presence of food.