Y2K is a late 1990s and early 2000s aesthetic of low-rise jeans, metallics, and optimistic futurism, celebrating millennium-era fashion and technology and experiencing a massive revival around 2020. Low-rise jeans cover the bottoms. Bedazzled tops go above them. Velour tracksuits cover the casual end. Platform flip-flops go below. Butterfly clips sit in the hair, with tiny handbags, colorful tinted sunglasses, and metallic fabrics.