We had customizable underwear in 1.0 (they were specific 'small clothes' slots that added nothing to stats but were simply glamour - the 'hempen' sets originally were equipped in these slots, as was the Moonfire Faire swimwear). Needless to say, seperate underwear equipment slots were scrapped in the change over to ARR and the gear that formerly was equipped there was changed to normal gear but for glamour purposes only. So like visible equippable belts, I do not see SE bring them back I'm afraid.