1.5m is enough. However, vests have inner and outer materials, and they are different. So different materials need 1.5m each. For example, height 175 is in the range of l and XL. The length of vest is 1 15cm, and the width of fabric is estimated to be 60 inches, that is, 150cm. In other words, the fabric with the length of 1.5m can just be made into a vest.