i'm going to a wedding in august, we just received in the invitation so obviously i'm already planning my outfit. the time/location/invitation is so all over the place it's hard to tell what's appropriate for attire.

first of all, its a backyard wedding in august. BUT the ceremony starts at 6pm so to me that means a little dressier than a typical "backyard" wedding. the invitation says semi-formal so again, a little dressy BUT then it also says "dress for summer! flip flops and sandals without heels" so that sounds super casual.

what would be the safest to wear so i'm not too casual but not over dressed?
i made a couple of collages while browsing for ideas. what do you guys think?

http://i.gyazo.com/cf721eabf32.....6ea22c.png
http://i.gyazo.com/c74d291d0f3.....1eb1ff.png
http://i.gyazo.com/2f33eb1b955.....d44f53.png
http://i.gyazo.com/bce4caa8b0e.....8e450f.png