I am going to bring in some suits for alterations and some shirts to be fitted. Thinking of getting some custom shirts too. Will let you know.
I can tell you from first-hand experience that MTM or "Bespoke" shirts from Harry Rosen will not turn-out well. Just trust me on that one. Find a proper shirt maker.
FWIW, I've done MTM armani/samuelsohn, "bespoke" shirts (it's really a hybrid mtm program that doesn't work), and bespoke sport coats (true bespoke) at the HR in montreal.
Seriously, don't waste money on their shirts. I even had the benefit of the bespoke tailor fitting me but they **** them up where they make them in Toronto. Every time the shirt came back for pinning and adjustments, they messed it up some more, often by undoing corrections they had just made.