Don't limit yourself to that area. The finest tailor in my opinion in the GTA is on the Danforth. Store is called Caruso's. Their genius' at their craft and always insist on two pairs of pants for a minor uplift. And the way they put together the suits for me, where they have a lot of room for adjustment as my weight fluctuates from 220 to 250
I've been very pleased with Moda by Francesco, on Wilson just a shade west of Bathurst. He's a young Italian tailor with a sense of style and his own small shop. He has tailored several suits for me, and one of these years I am going to have him make me one. He suggested the cost might be $700-$1000, depending on the fabric I select.