If you've never had a custom tailored suit, it is highly recommended that you do. The experience of being measured and fitted is something that every man should experience. Furthermore, it is suggested that if you do go for a bespoke suit, you do it on Savile Row in London. However, that experience may be limited to those with expendible income.
For the rest of us, until we can afford to take a flight to London just to shop for suits, take a look at this infographic to learn a bit about the proper methodologies involved when purchasing the best garment you will ever own.
Remember, a perfectly tailored suit is a must for every gentleman's wardrobe. [visual.ly]