What is this Vintage Dior Piece?

Hello! So I recently acquired a few vintage Dior pieces, but one them has me puzzled. It's got the Dior label, as well as ILGWU tags. It's deep blue Qiana fabric, style 62213. It has button closures at the top and the neck, with a dagger collar. It also has pockets. I'm assuming it's circa late 60s/70s. But I cant figure out if its a dress, nightgown or caftan. I can't seem to find the same style anywhere either. Any help would really be appreciated!

 

This is a licensed Dior piece made in US.

 

The Christian Dior label has very crooked sewing, I've never seen such a bad job made of it, even from Dior's department store stuff.
The RN number, 14522, comes back as EYE-FUL LINGERIE INC.
https://rn.ftc.gov/Account/BasicSearch

A previous thread with Eye-Ful info:
https://forums.vintagefashionguild....-eye-ful-peignoir-top-company-info-etc.81223/

Quiana nylon was introduced to the garment industry in 1968 and was very popular in the '70s.

"Made in the USA" was was mandatory on union-made garments from 1985 onwards.
https://ilgwu.ilr.cornell.edu/timeline/union-label-timeline.html

It's worth noting that, for lingerie, the color of the union label is not an indicator of age. They were often solid blue or black or simply the color of the company's logo.

From our label resource: