I bought this at Costco. It's a so-called flannel shirt, and I think the shell buttons are stylish. The inside of the collar and the inside of the cuffs have a denim paisley pattern, which is really cute. You can roll up the sleeves and fasten them, as shown in the fourth image. I think it would also look stylish tied around the waist. How about it for this time of year? The size is S, but it's about the same as a Japanese M. Please refer to the measurements. Shoulder width: 38 cm Body width: 43 cm Length: 69 cm