Casual attire wording

Ok, I know the strong opinion is not to include a dress code on the invitations. However, my mother has specifically requested we provide a dress code recommendation on our directions cards. We are having a rustic vow renewal, I will be in a dress and boots and my husband will be in jeans with a vest and blazer and boots. The ceremony is outdoors and we want to make sure everyone understands this is not a formal event. What wording could I use on the cards to express that jeans and boots are acceptable, and formal attire is not necessary?