The only place I could find in Toronto to rent a decent quality Morning Suit (trust me I looked long and hard) for my wedding and my groomsmen. Andrew's actually imported their Morning dress attire from Europe and the quality difference shows. Everyone at the wedding looked amazingly smart.
All of the staff at the store were professional and courteous. From the initial meeting, to the fitting and even when we returned the clothing after the wedding. Do not be put off by the location of the store - it is worth the trip there from wherever you might be in the city. We trekked out there from the downtown core and I am glad I made the effort.
In summary, high quality attire and high quality service. I wouldn't hesitate to recommend Andrew's to anyone looking for decent formal clothing rental.