Vintage 70s: floral keyhole front short sleeve dress

Pretty 70s floral dress with a dramatic keyhole opening in the front. It is hard to see on my mannequin torso because it is for a bigger size so it doesn't open right. It opens enough to show cleavage if you want. Comes with a matching belt / sash. No brand tag. There is a size tag (vintage 10) and washing instructions. No materials tag. Feels like a poly blend. It is lightweight, has a sheen to it, and some stretch. Dress has pretty short sleeves that drape down. There is a zipper in the backside. Dress is in nice condition. The colors are all pale enough they seem like neutrals. Looks like peach, beige, white , tans, and pale yellow. Flat lay measurements: -Across chest underarm to underarm 18" stretches to 20" -Across waist 14" stretches to 16" -Length from top of shoulder near neck to hem 41"