Vintage Women's Waltah Clarke Hawaiian Dress MuuMuu Size 12 (modern 8, I think)

I'm selling a women's vintage Waltah Clarke maxi dress (muumuu?), with a lovely blue pattern. It's in amazing shape. It says it's a size 12, but I'd estimate it's a modern US size 8 or so. Vintage sizing generally is a bit... smaller than it is today. Non-smoking, no pet home.