blue seashell dress Bette Thin Strap Maxi Press lightly for a fancy look. LENNY DRESS DEEP SEA BLUE

Considering that at the turn of the 20th century, essentially all women's skirts were floor-length, be they smart or casual, this is perhaps where the assumption comes from

A mermaid is a beautiful, formal, elegant choice that suits dressier and evening weddings wonderfully, requiring attention to formality, an appropriate color that is never white or bridal-adjacent, a modest and comfortable fit, and styling that keeps the spotlight on the couple rather than the guest

A-line pleated mini skirt hits above the knee structured yet fluid in motion

Colors to generally avoid include anything too close to white, like ivory or cream