Diane Von Furstenberg for I.Magnin, Vintage Nightgown Nylon Medium

Diane Von Furstenberg nightgown for I. Magnin RE-7, size medium.  The gown is floor length, long sleeves with off white lace inserts, button front, with a square neckline and two pockets.  The fabric is a peach nylon, machine washable gentle.  This is from the estate of a lady who had a lot of vintage nightgowns, and this one is in good condition from the 1990's without stains of tears, there is a small pucker in the fabric, see the last photo.  Please compare your sizes to the garment measurements I took with the gown lying flat: -underarm to underarm, 19.5" shoulder seam to sleeve hem, 24" length, 53.5"