Aldo Martins colorful zip up dress size 8 or 10?

Aldo Martins colorful dress. The fabric and size tag have been cut out but other than that it is in excellent condition. Zips up the front. Attached belt to tie in the back. It’s beautiful. My guess according to measurements is it’s a medium. Maybe an 8 or 10? Can’t be sure about the fabric but almost looks like there may be some silk if not all silk. Measures 18” from armpit to armpit. 21” across the waist and it is 38” long.