This dress is rayon acetate, made in the early 60s I believe. It's a vintage size 18.5. Here, you can really see the sweet pattern.
And here's a photo from the seller's original post:
There are belt loops on the side but it didn't come with the original belt. This dress great for Easter, or any time, really. Like I said, I'm sad to have to let this one go but it's too big on me. If you're interested, leave me a comment! I'm happy to answer any questions.