A hexblade's pact weapon gains "your implement's enhancement bonus, critical hit effect, properties and powers" when conjured from an implement held in the off hand. If "belonging to an item set" count as "properties", and the pact weapon is conjured from an implement that belongs to a set, does the pact weapon then count as another item that belongs in that set?
For example, say my hexblade can treat light blades as implements and is holding a Rhythm Blade Shortsword in his offhand- the rhythm blade shorsword counting as part of the Blade Dancer Regalia set. Since the pact weapon is derived from the Rhythm Blade Shortsword, would it count as another part of the Blade Dancer Regalia set and, together, the two swords would qualify for the 2 item bonus?