This is an unconstructed jacket from BEAMS F made of silk and wool. It's a navy windowpane jacket, and the silk's luster gives it a luxurious feel. Made in Japan, the pattern is designed to fit the Japanese physique. I believe the purchase price was around 100,000 yen. How about it for three seasons, excluding winter? The size is 93. It's probably around a size 44 in other brands. It has side vents, a three-button roll-through closure, and functional sleeve buttons. The lining is cupro. There is no brand tag. - Shoulder width: 42cm - Pit to pit: 46cm - Waist: 40cm (flat measurement) - Sleeve length: 60cm - Length (from collar seam): 70cm