Both the wedding ceremony and reception will be outdoors and the dress code is casual. So basically wear what you want. If you want more guidance than that, summery or cocktail dresses for women and buttoned shirts with or without ties are great for guys. If you want to dress more formally, that is fine too! Ladies, it is highly recommend that you wear shoes that are supported enough so you can walk through a hay field. The weather is looking like a pleasant 78 degrees and sunny, cooling down quite a bit at night so do bring a sweater or jacket.