40s/50s white ribbon knit dress with order matching belt

I've had this order dress for a bit, I believe she's a 40s/50s ribbon knit dress?! This white dress is insanely beautiful, and it has a matching belt!! Came from an estate with clothing ranging from the 30s-60s. It has few spots where the lace has been stretched a bit, but not too noticeable at all really. Looks like there was a tag that has been cut out. Other than that it's in lovely shape! Measurements taken flat.
Shoulder 15”
Pit to pit 18-20”
Waist 15”-16” can be tied smaller with belt
Hips 19-21”
Length 43”

Asking.