To keep your collections consistent, we maintain three core fit blocks for bomber jackets. The classic block has balanced rib heights and a regular body length; the boxy block is shorter in length with a broader shoulder and fuller sleeve; and the oversized block extends the body and drops the shoulder for a more relaxed, streetwear-oriented silhouette. Standard sizing runs from XS to 3XL, but we can develop custom grading rules based on your existing charts or on reference samples you send us. All blocks are tested for armhole mobility and rib recovery after washing, which is especially important for bomber jackets with heavier insulation or coated shells.