There is a really old place called Karachi achkan or something like that (I forgot the name) - its on frere road where the homeopathic market is and there is the old Agfa photo shop on the other side - its like 100 steps from Pakistan chowk.
if they still are in business - they are really good, If the old man is still alive, do not ask for any embroidery work, he will hit you with his cane.
For suits, there are a few threads on PW already about it.