Nice goth shop on Saint Hubert...definitely stands out from the rest of the shops in the area and does more of a renaissance goth than modern goth. The clothes are pretty and ideal if you're looking for renn faire wear.
They also have other goodies like decor for the home and a selection of swords and knives. The jewelry is also unique and seems to be made exclusively for the shop. I would definitely come back if I come back to Montreal.
Their website: http://bijouxmedievaux.com/english/