Three days might work if your not seeing the same people and you are a hell of a lot easier on your clothes than I am. But my suits usally need a day off to air if I've been wearing them for 8+ hrs straight.
I'm in the financial buinsess also but fortunately I'm away from the public most days so its business casual for me 80% of the time.
The biggest issue for me these days, which many have mentioned, is fit. If your suit fits, you feel good and you look good. If you know your size and have a good tailor to alter what you buy off the rack you should be all set.
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