You might think a royal garden party is super strict, but the real rule is common sense. Leave the ripped jeans, flip-flops, and slogan t-shirts at home. No one wants to see your band logo next to a potted rose bush.
This Is How Kate Middleton Dresses for a Garden Party | Glamour
Also, no short shorts or miniskirts. This isn’t Coachella; it’s a place where people sip tea and talk about the weather. And please, please don’t wear a baseball cap. Unless you’re the groundskeeper, it’s a no-go.