Them brown items is called heirloomies, and they does some nifty stuff. First all, they scale with ya as ya season up. Armor, stamina, crit rating, brains, whatever spec they got keeps pace, so they is always the same as a blue item set fer yer level. Not bad, huh? Next, they's sorta soulbound, but not completely. Ya can send'em through the mail system ta other members of yer team, and shares as needed. Unfortunately, there ain't no way ta get'em across the faction barrier, so fer examples I couldn't hand one to Phoenicia or Pali. And no gettin' from one serververse to another, short of smuggling a whole team member over. Final nifty thing is, the shoulders? They gives a 10% XP boost fer quests and killings. Nice fer those of ya what got alts wanting to get ta they's 80th season.
So, Ratters, I want! How I get? I's so glad you asked. Ya buys them with either Emblems of Heroism, what drop off of heroic-level and raid bosses, or with Stone Keeper's Shards, what drop off of any dungeon boss when yer faction controls Wintergrasp, or buy flying over there and doing quests. Ta gets the first ones, ya gots ta be in yer 80th season; fer the second, ya don't gots to, but it helps. Emblems buy heirloomies what be optimized fer PvE while Shards buy gear what be optimized fer PvP, but ain't no law saying ya can't use'em fer leveling, especiallies with that 10% XP bonus. Here's a list of Emblem heirloomies, what ya can buy in Dalaran, and here's a list of Shard gear what ya buy in Wintergrasp.
So, heirloomies is shoulder armor, weapons, and trinkets. If yer one of them classes what learns ta wear a new type of armor at the 40th season, like us warriors gettin' plate, is no worries. The heirloomy armor will adapt itself to you, so fer example The Shiny Polished Spaulders of Valoriciousness acts as mail untilk ya dings 40. Word is, is gonna be more heirloomies in 3.2, including chest armor what gives another 10% XP bonus. Stacks with the bonus from the shoulders, if ya gots both, for 20% extra experience!
So there ya gots it. Hopes it were helpful ta one or two or eleventy-six of you buggers.