I liked Sir Paul Smith's explanation of a good suit the best:
"It does the job . . . makes you feel elegant, important, sexy, tall . . . A good suit is like when you close the car door, and it's a nice car, it's got a sound about it, or if you got a knife and fork in hand and it's got a good weight about it . . . a good suit has that solidity and importance about it that equals craftsmanship . . ."