What to wear to a backyard wedding?

marsdgost

My dad is getting married June 14 in his backyard. It's on a lake and is pretty, but it's still a backyard. I have no idea what to wear. It's going to be casual, but I will be the daughter of the groom, so I feel like I should dress up for the occassion.
I'll probably wear wedge sandals as my shoes, but what kind of dress would be appropriate here? How about this Style Hunter Caribe Maxi Dress?
but the color is not bright. Any ideas would be great, but Im looking for something under $100.

TIA

[Deleted User]

Hi everyone!

We are in the process of making our wedding website.  We are tying the knot on      September 15, 2012!    We need your help with how to describe the guest attire.  We are having a backyard bbq style wedding and want the dress code to be casual but no jeans or shorts.  We are looking for some fun wording to get the point accross.  HELP!!

Thank you!