Black crochet lace dress / beach cover up

LOVE this little black number for layering any time of year or throwing on after a dip at the beach. I picked it up at a small Montreal boutique and it doesn’t have any tags so unsure the brand or fabric content, but it feels like cotton to me, or possibly a blend, and it’s likely S. Has some stretch. Worn maybe 3 times, excellent condition. Measurements: Pit to pit: 17” Length: 43.5”