Bespoke tailoring comes from a time when particular bolts of cloth would "be spoken for" and reserved solely for use by that customer. As cloth-dyeing and general manufacture of fabric was far more "hands-on" in those days (1600-1850), a customer could be sure that if he bought the job lot, his suits would be one-of-a-kind.
Today, I think of "bespoke tailoring" as more than made-to-measure in that it does not modify an existing suit to fit differing shapes (customizing), but can and is usually a one-of-a-kind suit and shirts, which are completely designed AND cut AND measured on the same premises, often from exclusive fabrics made solely for that tailor. The cost, needless to say, is astronomical, but like hand-made shoes, in which a wooden last is hand-sanded to match one's feet, the fit and finish is superb, and the suit, barring vast weight gains or losses, should last for decades.
In other words, you've got to really want bespoke tailoring, because a suit, two pants and four shirts can cost the same as, say, a Toyota Camry. But you, my dear, will look beyond good. In a bespoke suit, a vast number of figure incongruities can just...go away....