Wedding dress suggestions

💫🌞

Please help

So my Aunty and uncle are having a wedding in fiji on a beach and the service you don’t have to wear shoes because it’s on a beach so I was thinking of wearing white burks and then at the thing after the service changing into heels, it’s going to be a fancy but not too fancy wedding and it’s in 2 weeks and I’m wrecking my brain over what to wear, I’m 15 and not apart of the wedding if that helps

Please help me