I ordered this sweater in red, size medium. I am 5’8”, approximately 155-160lbs., 30” waist, 36C bra. The medium fits well.
The knit on this sweater is definitely on the heavier side, and the yarn is very soft. Definitely meant for cooler weather. The gold button makes a statement and makes this feel more like an over-piece, to be worn over a sleeveless shirt. Other reviews mention having difficulty with fastening the button, but I found it fine if I put the shorter end of it through the buttonhole first.
Nice, heavy sweater with an upscale look.