This is a lovely dress and the fabric is perfect Cynthia Rowley Stretch Velvet Bell Sleeve W/Emb Dress Size 8 US /Aus 12 BNWT.
Measuring laying flat.
Underarm to underarm 44cm
Waist seam to seam 38cm
Length 90cm
The last photo shows a similar Dress just to show how it looks on.
Please check measurements for sizing.