[Darkling]

Originally Posted by Penny

Darkling thats cool. Can you say hi to the queen from me?? Just say Penny says Hi she'll know who you mean.

Would a ball gown be more fitting??

Not for a garden party.

Gentlemen wear morning dress, lounge suits or uniform; ladies wear afternoon dress (usually with hats). National dress can also be worn.

Here is the official info on garden parties.