A nimble chestpiece can be won from Treasure Hunter. It can also be obtained from completing The Pit (regardless of success) at a 1/3 chance. It could also be created from 500 lightweight feathers when these were obtainable between 10-14 March 2016. It boosts Agility experience by 1%. Wearing all five pieces of the nimble outfit will give 1% bonus experience in addition to the 5% from the individual pieces, for a total of 6%.