This item is acquired in-game. See its sources below.
In the Appearances collection, Suffused Legguards is listed as World Drop. Appearance ID: 80083. 2 other items wear the same appearance:
Read from the World of Warcraft client build files.
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Suffused Legguards suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Suffused Legguards is part of the transmog set Suffused Attire (Warrior, Paladin and Death Knight only). The other 16 pieces:
Suffused Armplates
Suffused Girdle
Suffused Mantle
Suffused Gauntlets
Suffused Sabatons
Suffused Breastplate
Suffused Helm
Suffused GreatcloakScalewarden's FaceplateScalewarden's Plate CuirassScalewarden's Plate SabatonsScalewarden's Plate GauntletsScalewarden's Plate LegguardsScalewarden's Plate SpauldersScalewarden's Plate ClaspScalewarden's Plate BracersBuilt from the World of Warcraft client build files and recorded Auction House snapshots.
Suffused Legguards is not traded on the Auction House, so it has no live market price. It is acquired in-game from the sources listed above. This page collects its first-party game data (identity, effects and where it comes from) from the official World of Warcraft client build.
TheWoWDB