My cousin's wedding in a few weeks has a dress code on the invitation: Dressy casual. It's at a church (evangelical Christian) and there will be dancing. This is in Texas, indoors, in the A/C. (It IS May.)

I'm not sure what dressy casual means! Or more accurately, how I would interpret it. I don't want to buy anything for this. My wardrobe is plenty big, and very much focused on flared skirts and dresses. Any ideas?