This COS top is navy blue and is a Size M. The front and sleeves are made from 100% cotton and the back is 100% silk. It has three-quarter length sleeves and buttons fully down the back. The length at the back is longer than the front.
The approximate measurements, when laid flat, are:
Armpit to armpit 20.25" (51.5cm)
Armpit to hem 15.5" (39.5cm)
Shoulder to hem 24.5" (62cm)
Armpit to end of sleeve 12" (31cm)
Nape at back to hem 28.25" (72cm)
It's in very good condition and, as with everything else I am listing, comes from a smoke-free home.