Whether you wear it under a dress or over a bralette, this long-sleeve layer is equal parts chic and versatile. It’s made from mesh—the kind that feels satisfyingly stretchy and substantial rather than tissue-thin—with a tight fit and a semi-sheer finish. The classic cut has a mock neck, slim sleeves and a full-length hem. The only way you can mesh up? Not adding-it-to-cart ASAP.