Guild Wars 2

Hey Guys, I recently previewed a piece of light armor in the bank called ‘Guild Pants’ and was just wondering on how to get them? I can’t find anything on the wiki or on google

http://wiki.guildwars2.com/wiki/Guild_Archmage_Pants

These? They are unobtainable, but you can get the Devout set instead, it looks the same.
http://wiki.guildwars2.com/wiki/Devout_armor/Acquisition