With their rising new threats to the Equestria and her empire, the need for a strong standing and modernizing military defense force is required. This included the necessary upgrade and updates to the royal guards and their standards. Uniforms for one were certainly in need of a more lighter, mobile approach, giving the many mares and stallions better movement and not having to deal with the weight of their armor. That and the modern magic bolt weapons (aka guns with magical enchantments being the means of firing) that are now a days being crafted by smiths and specialists across the ever evolving rule as technology ramps up in scale. Their royal majesties now decked in their new uniforms inspecting the troops from all over the place. What with the little banana their in his own uniform their to see how mama and his papa do it.