Free People Silk Dress/Tunic, NWOT. size 8

This is a Free People 100% silk dress or tunic, I bought it to wear as a dress with tall boots. Once again, I never left the house in it as I’m tall, making it short. It says it is a size 8, which is a bit confusing to me. For reference, I’m 5’8” and weigh about 120 and this fits me perfectly. Armpit to armpit is 18”, neckline to bottom hem is 27”, widest part of the waist is about 20”. This is truly a stunning dress or top depending on how you look at it. I have held onto this for years because I couldn’t part with it. It is NWOT, in perfect condition. Button detailing down both sides. Please ask if you’d like any additional measurements or photos.