Halo 4 Armour was cool but the downside was that everyone pretty much looked the same but with different colours.I honestly preferred the reach way of customization because you didnt look so much like a robot than a human.
So maybe we could have all the armor from halo 4 and more, and have the ability to customize each bit for example, the chest could have: grenades, walky talkies, tactical pockets and small backpacks and this could be put on the base of a recruit chest, a scout chest you name it! I think they should bring back the Utility armor slot as well as the armor effects. And on a different note their should be a way to customise your own skins, and make you really stand out from the crowd!