Less formal than "black tie". Pops of color are welcome. Dressing to match the the color palette is not necessary but encouraged.
Gentlemen - A tux is not required. Think suits, button downs, bowties or ties and dress pants.
Ladies - Floor length gowns are not required. Please do not wear white or ivory in order to honor the bride (This is the only time you'll probably EVER see her in white 😆).