This dress is butchered, on the inside anyway. It’s wearable as it is but it’s not at all how it was originally designed and I don’t think too much can be done to restore it. So here’s what I have noticed. The side seams have been taken in from the underarms to the hem by a half inch on each side *except* at the waist. The waist was taken in rather dramatically, and fabric cut away. I don’t think it was originally designed to taper in at the waist but that’s what it’s doing now because of the alterations. Also, I think enough fabric was cut off to make the waist taper that they could use the leftover to make the belt. Furthermore, the upper seam at the waist was taken up to make the waist sit higher. It’s machine sewn but the pink thread is a slightly different shade than the original pink thread throughout the dress. So the waist was originally lower but someone altered it so it sits higher and then hand stitched the excess fabric at the waist to the seam by folding it back on each side and hand sewing it down.
So I guess to accurately date it, you would have to picture the waist sitting a bit lower, about an inch, and the waist is straight on each side and not tapered. And no belt. Crazy. I would love to put it back to its original condition but it’s missing too much fabric at the waist. I am still able to repair it by fixing the “belt loops.”