Men’s Jackets and Vests Start by wearing clothes of a weight you think you’ll be wearing when you use the gear you want to buy. To measure, please use a cloth measuring tape. 1) Stand naturally, and ask the helper or yourself to put the tape around the fullest part of your chest, just under the arms, and pull the tape around the front. Don’t pull it tight, just barely take up the slack and get your reading. While this is going on, don’t puff up your chest or collapse your chest… just stand normally. 2) Now do the same thing on your belly, right around the fullest part, which is typically just above the navel and over the love handles while standing in a relax position. Please select your size based on the measurements from size chart in the pictures.