I agree with HLGEM above. Just adding a facet about "when to start" and building a wardrobe.
If you're going to do this, you'll have to accept that will take a long time and a considerable investment to put together a good wardrobe of suits, jackets, shirts, sweaters, trousers, and shoes. So, yes, start now and build it up gradually piece by piece.
It is best to invest in very high quality stuff with tailored alterations. Start with wool slacks and fitted shirts. If you get the good stuff it will be even more comfortable and look better than your typical department store business-casual. There is a little variability with wearing a suit, you might get away with a jacket and appropriate slacks or even a nice sweater. Younger folks can get away with less conservative but still elegant and fashionable choices (ymmv depending on culture).
Over time it will become integrated into your appearance and the expectations people have about how you look.