Regular wedding guest attire. I would avoid going super formal, like sequins and anything that would catch on folding chairs and tables etc. It's a beautiful, yet slightly more casual setting. There is a beautiful garden that you will likely want to walk through. So, stilettos would not be smart. Mid-heel to flats would be comfortable.
Whatever you normally would wear, keeping in mind that is a barn, so some breezes come in. Include a sweater or jacket for warmth if necessary in your outfit.
It's a very nice barn with real floors so wear whatever you normally would wear to a 3pm spring wedding
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