Darnassus Sentinel and Silvermoon transmog sets have been datamined on the 10.2 PTR, featuring a tabard, cloak, and shoulders. These sets would be perfect for players that are looking to resemble city guards, as the shoulders are similar in silhouette to those worn by the Darnassus Sentinel and Silvermoon City Guardian.
While the Blood Elf items aren't in our PTR database yet, we've found the Darnassian Moonsilver Spaulders, Darnassian Cloak, and Darnassian Tabard alongside a Singed Darnassian Tabard quest item, which implies we'll be completing an in-game story to acquire these rewards.