Ports international linen dress. This is off-white, cream color. Ivory?

Not pure white

I am every bit a size large and it fits me, but the tag says medium.

Hem is single stitch and below knee

It does have a small stain on the front and a little "ring around the collar" ... I did not attempt to stain treat this.

The dry clean tag on this was from May 30, 2017, so it's been hanging in the closet awhile.

I believe by the look and feel that this is vintage, but I cannot find verification of this

Pintuck pleats at the top, flowing to the bottom with no pleats