Modest evening dresses must adhere to specific coverage standards while maintaining formal aesthetics. Key specifications include high necklines (such as crew, boat, or mandarin), full-length sleeves or three-quarter sleeves, and floor-length hemlines (maxi). Additionally, the use of opaque lining is critical to ensure the garment is not sheer, especially when using lace or chiffon. For B2B sourcing, ensure the back design is closed and avoid high slits unless they are layered with internal panels.