Piercing Clarity and flawless black dragonscale robes

[jamkriz]

My search-fu may be weak but does anyone know if "Piercing Clarity" will stack with the flawless black dragonscale robes when it comes to fortification bypass?

[bollwerk]

My search-fu may be weak but does anyone know if "Piercing Clarity" will stack with the flawless black dragonscale robes when it comes to fortification bypass?

I don't know for sure, but based on this, I would guess yes.
http://ddowiki.com/page/Armor-Piercing