Pre-owned size 38R (48R European size) Z Zegna suit jacket in navy blue pinstripe.  100% wool suit. The Drop 8 is a slim fitting suit, and this suit has been tailored to the measurements provided below.  Selling because this suit no longer fits me, as I've put on some weight.  I would say the jacket fits like a tighter 38 and could fit those that are between 36 and 38.

Jacket measurements:
Shoulder width (seam to seam, not to outside of shoulders) ~17in
Waist width ~17.5in across front
Jacket length 30in

The jacket has, conservatively, 1.5 to 2.0 inches if you want to add width to the chest or shoulders and approx 1/2 inch to lengthen the arm length.  Happy to answer any additional questions you have, please feel free to ask.