Distinguishing Features

From: Fabien Delamode
Description: I refused to work with the stolen crystals, and the lady took them away. She left me in anger, the hem of her cloak fluttering... I have a similar cloak. Bring me some tools, I'll add a few details, and you'll see exactly the same burnous cloak the guest wore.
Completed: This cloak, along with the jewelry I described, are all the distinguishing features I can name. The lady's face was hidden by a mask, but she acted as if I should've recognized her. Any idea who it might've been, Monsieur Black?