Vintage 50s/ Early 60s Suzy Perette Blue order Silk Floral Dress M

Elegant blue-multi silk floral dress from “Suzy Perette”. Such a pretty shape! Wide band around the waist, with self-fabric detachable belt with bow. (There are no belt loops, so the belt is fully optional.) Fabric gathers above and below waistband. Back zip with v neckline. The dress is fully lined in pale blue acetate.

Condition: Overall excellent. There is a faint halo of a mark on the front bodice - barely there, see order pic. I have hand washed the dress, but not the belt, and the silk is soft with a nice drape.
There is a mark on the back of the belt that I have not tried to remove.

Size: No size label, I will call it a medium. (Clipped to dress form to show shape.)
Please see measurements, taken flat, doubled, where applicable:
Shoulder to Shoulder: 16”
Bust: 39”
Waist: 31”
Hips: 42”
Length: 42.5” ( measured from top of front bodice to hem)
Sleeve: 10”
Thanks for looking!