The Men's Cockpit USA G-1 Brown Goatskin Leather Flight Jacket in size 48 is a high-quality military specification jacket made in the United States. The jacket is crafted from durable goatskin leather in a rich brown color, with a classic G-1 Flight Jacket design that exudes a rugged and stylish look. It is designed for regular fit and should be dry cleaned only to maintain its quality. With its Mil-Spec construction and American craftsmanship, this jacket is a versatile and timeless piece for any man's wardrobe.

USN. $780 new. Excellent condition. Worn a couple of times. 
If you know, and this is your size, this is a classic. Runs slightly smaller for a tighter fit. 

Some measurements (see pics)...

Pit-to-pit (across the front) - 25 3/4"
Shoulder seam to end of end of sleeve - 27.5"
Top of collar to bottom of jacket (down the front) - 30"
Shoulder seam to shoulder seam across the back (under bi-swing) - 20"