I'm having my wedding at the group camp area of a state park. It has tons of outdoor space, little rustic cabins, rec hall, fire pit, dining hall, etc. I'm planning to get a simple tea length dress and my FI isn't rocking a tux or anything. We are probably doing a pig roast or bbq/grilled style meal. My close friends 'get' the idea but I'm afraid some of our family members only know how to associate 'wedding' with formal/traditional attire. How can I drop the hint on my invitations about the atmosphere/attire? If I say casual, will they think jeans? Help!