Imperial Plate

The Imperial Plate is an 7-piece armor set with heavy stamina and strength bonuses, crafted by Blacksmithing. During the World of Warcraft alpha, the armor set was intended to equip human footmen.

Source
All items are crafted via Blacksmithing

It takes 135 Thorium Bars to get all the plans. Once a blacksmith has all the plans, it takes the following materials for a full set:

114x Thorium Bar, 12x Rugged Leather, 1x Star Ruby