Its an outfit you get from training your agility. You collect Marks of Grace ( which is currency to get the outfit) throughout your trips on a course. Your best bet is to get your agility to 40 (while still collecting the marks of grace) then doing Canifis agility course since its the fastest marks of grace drop (as far as I know) no matter what, you want to just do Canifis till you have enough marks of grace for full graceful. The droprate of marks of grace slows down after 20 lvs of being on that course so you could do Canifis to 60 for your marks of grace, but you'd have enough by 54-55 agility. When you have 61 agility Canifis is pretty much useless and the drops for the marks of grace slow down. After that you just want to train agility at the best course, but stay in canifis only for the marks of grace. The Graceful outfit replenshes your energy faster as well as slow down your energy usage. Many if not all players use it to save them energy when they're running around alot especially for quests. If there's anything I left out then sorry for not mentioning, but I think that should be all you need to know. Hope this helped!