The scariest part of ordering a bespoke suit online isn't choosing the fabric or the price. It's this: taking your own measurements, without a tailor present, with the fear of getting something wrong and ending up with a suit that doesn't fit. This fear is understandable. But it's also quite unfounded, if you know what to do. With a tailor's tape measure, someone to help you hold it, and five minutes of concentration, you can get measurements as precise as a tailor's. Perhaps even more precise — because you take them on yourself, in your normal posture, not in the...