V neck Lace Silk Satin lose slip dress

I had plans to wear this w belt and heels during summer but it never happens. I think it’s silk but I don’t know, there is no label. Posted the model wearing something in the same type of a style to show the idea of the dress, she is not wearing the same dress that is up for Sale. There is no label inside m, bought it from planet blue in Malibu a while ago. It has really nice details and would make such a pretty dress. Also has pickets on the side I’m not sure what Sz it is but it will fit size S-L depending how lose you want it to be. I’m between S and M and wear it w belt The strap needs stitching it’s loose. Took picture.