This dress has been in my wardrobe for years but it has hardly been worn.
It is approx 38 inches long and is approx 19.5 inches from underarm to underarm. I’m a size 14 and this fits me well. A Wallis medium is listed as a 12-14.
The dress is a stretchy polyester. It has a large medallion detail.
I would say this is very good condition.