A sweetheart neckline is a wide, plunging neckline that dips down in the center, creating a subtle heart shape that flatters the décolletage. Common on dresses, blouses, and tops, it’s crafted from soft, drapey fabrics that accentuate its gentle curve. While its origins can be traced back centuries, the sweetheart neckline remains a timeless and feminine design element, enhancing the elegance of any attire.