Few people are actually the exact proportions of a nested suit. Suit separates, meaning The blazer size and pant size are sold separately, give you a better chance of getting that perfect fit. Heavy alteration can ruin a suit's proportions. The separate experience is the closest thing to custom, allowing you to find the most accurate size pairings without spending a fortune. Don't hesitate to purchase a second set of pants if you wear suits often to ensure you get the most longevitiy out of your garments.