You could but it wouldn't have the same relaxed, casual look and feeling. The way our washed jackets are produced (just like boglioli, lbm 1911 etc.) is that the garment is made with undyed fabrics and washed and dyed after they are completely constructed. This allows the dye to gather at the seams and give you the beautiful highs and lows that are associated with those types of jackets. If you dyed the fabric first, the garment's color would be completely uniform.