My girlfriend bought me my first fitted dress shirt. I am embarrassed to admit that I didn't know the difference between the fitted shirts and the ones I wear. I wear what my father always wore when I was growing up. I copied him, and didn't give it a second thought.
Given the option, I would have all of my dress clothes tailored, but I can't afford this. The cost of tailoring clothing can add up rather quickly. Thanks to my girlfriend, I have discovered that fitted dress shirts are an adequate alternative to having my shirts tailored, and by buying the fitted ones I don't have to spend the extra money on alterations.