The host trying to let you know they are looking for an intentional smart, casual look. This is a notch below “dressed up but has playful summer feel to it. Light colors, light, fabrics, and patterns — especially florals — are the order of the day. It's more of a feeling than a rote description, and as such you’re going for the essence of something. That something is whimsical yet classy, playful with an air of formality, fun but in a way that still marks a special occasion.
Remember the venue...
Comfortable fabrics + footwear that can withstand outdoor conditions
Women opt for midi-length dresses with floral prints or bright colors
Men should wear a linen suit in a light color or blazer with tan dress pants. A tie is not necessary but feel free to accessorize with other items.
Still confused? look at the example photos