df5935a1__and_Guide___Page_77___GameSpy__Description
[Quest Name] The One True Pantaloons [Starting Location] Gallows Dungeon [Description] 
During the Dissent quest, you'll need to battle with various Lyrium Smugglers and their dwarven cohorts. One of the dwarves from the first of many encounters drops these. Apparently, Impeccable Bulf in Hightown is interested in taking them off your hands.
Dragon Age II - ps3 - Walkthrough and Guide - Page 77 - GameSpy
Description