Experience-boosting set

The RuneScape Wiki also has an article on: rsw:Experience-boosting set

Experience-boosting sets increase the experience gained in a specific skill when worn. These sets can be obtained in a number of ways. When every part of a set is worn, they provide a 2.5% experience boost. This boost does not apply to certain experience rewards, such as quest experience rewards or finishing a round of Wintertodt or a Mahogany Homes contract.

List of outfits

Skill	Set		Source(s)
Construction		Carpenter's outfit	Purchased with a total of 2000 points from the Mahogany Homes Reward Shop
Farming		Farmer's outfit	Purchased with points from the Tithe Farm
Firemaking		Pyromancer outfit	Obtained from opening supply crates after subduing the Wintertodt with at least 500 points
Fishing		Angler's outfit	Obtained from inspecting the trawler net after a game of Fishing Trawler Purchased from Alry the Angler's Angling Accessories
		Spirit angler's outfit	Purchased with Spirit flakes and a corresponding angler's outfit piece from Gita Prymes
Mining		Prospector kit	Purchased with golden nuggets from Prospector Percy's Nugget Shop
		Golden prospector kit	Obtained by using a star fragment on each piece of the regular prospector kit
Woodcutting		Lumberjack outfit	Obtained from Undead Lumberjacks during the bridge puzzle events in the Temple Trekking minigame

Other skilling outfits

There are several skilling outfit sets that, while they do not boost experience, are useful for training the relevant skill.

Skill	Set		Source(s)
Agility		Graceful outfit	Purchased with marks of grace from Grace's Graceful Clothing
Prayer		Zealot's robes	Obtained from looting gold chests within the Shade Catacombs
Thieving		Rogue equipment	Obtained from looting the safe at the end of the Rogues' Den minigame

Individual items

There are several individual gear pieces that are not part of a set, do not boost experience, but are nonetheless useful for training the relevant skill.

Skill	Set		Source(s)
Cooking		Cooking gauntlets	Reward from the quest Family Crest
Slayer		Slayer helmet (i)	Ability to assemble purchased from a Slayer master; imbued at the Nightmare Zone
Smithing		Goldsmith gauntlets	Reward from the quest Family Crest
Thieving
		Gloves of silence	Crafted by the Fancy Clothes Store in Varrock from dark kebbit furs