After the rebel cells formed the Rebel Alliance, Jaden updated his wardrobe to a more formal officers uniform. This outfit was used more for meetings than on the battlefield. He always wears his gloves to hid his amputated arms. Less detailed ref.
After Order 66, Jaden and his allies would go on to being forming one of the first few Rebel Cells. Jaden upgrades his older Lightsaber into a newer model that was more fit for his changed fighting style, modified form III. Blade was blue at first.