Great question! Our big and tall sizes aren't just larger versions of standard sizes - they're completely re-engineered for bigger frames.  Our "big" sizes (1X-8X) offer more room in the chest, waist, and hips compared to standard sizing. For example, our 2X is roomier than a standard XXL, especially in the midsection. Our "tall" sizes add extra length to accommodate taller guys. We've increased both the body and sleeve length, typically by 2-3 inches compared to standard sizes. In both cases, we've adjusted the proportions to maintain a flattering fit. Our shoulders are broader, our arm holes are larger, and our sleeves are cut wider to fit bigger arms.