There is a particular kind of frustration that happens in a fitting room. You pick up a pair of jeans that looked effortless on the rack, carry them in with quiet optimism, and then discover that they are too tight at the thigh, too loose at the waist, too long at the hem, or somehow all three at once. Jeans are simple in theory. They are one of the most familiar pieces in everyday wardrobes. Yet finding a pair that truly fits can feel surprisingly personal. A good pair of jeans does more than cover the basics. It supports your shape, works with your proportions, moves with your day, and…