I get my suits at Harry Rosen downtown . . . . probably too pricey for this thread though but thought I'd mention it.
Shoes I can buy anywhere and Mrs. Cowperson scoops up dress shirts and ties for me whenever she feels like it.
My rule for business wear is not to be a distraction to business . . . . so I tend to dress fairly conservatively . . . . . although the pink tie and pink striped shirt Mrs. Cowperson got me recently mortified me until the ladies I work around made cooing remarks about it.
http://www.harryrosen.com/english/home.html
Cowperson