Having a courthouse wedding ceremony? Yay! Unsure of what to wear? I have some ideas! I actually had a courthouse wedding and wore jeans and a sleeveless blouse. I think it totally fit my personality.
I bet if you go with a business-casual look; you will be fine. Maybe after the courthouse get all glammed up (or comfier) and have a dinner or romantic night alone. Congrats on your upcoming courthouse nuptials! I think courthouse weddings are amazing as you can save so much money skipping an expensive wedding.
Some couples would rather use the money they would spend on a pricey wedding...on property or a lavish honeymoon. And I do not blame them! Do what works best for you or a mix of a courthouse ceremony and your actual larger wedding.