This mother's dress is M565 style by Hynes Park in Shades of Blue. It has a Straight neckline, a Mid Back back, and is Floor Length.
Designer Hynes Park Gown: M565 Embroidered Lace applique Scuba strapless gown with tulle cover. STYLE#: M565 COLOR: NAVY Retail: $1,100-$1,300. I bought 2 dresses for my daughter’s wedding and chose the alternate dress. NEW with TAGS and has never been worn except to try on at dress shop, so no alterations of any kind. It comes with a zippered valet carrying bag. The size chart from the designer of this gown is included in the photos. My measurements are Bust: 41.5 Waist: 32 Hip: 44.5 Height: 5.8, and the dress fit me snug but nice such that no alterations would have been necessary.