V1 is the first suit seen in the series and the v2 is the one worn with the beskar armor. The main difference is the flak vest on the v2 is darker (to match the main suit) and the ab-panel is leather instead of fabric. There is a debate as to whether the v2 undersuit is the same color as the v1, so we'll be offering the v2 in both the original charcoal grey as well as a dark brown color.