I’m probably the wrong person to answer this, since I have expressed my dislike for weddings in general, but especially this aspect of such events. People showed up to my wedding in jeans, and I couldn’t have been more pleased. I did not specify on the invitation, but the wording was casual and the invitations themselves were simple and whimsical, and it seemed that people took the tone from them. Which is exactly what I had hoped. Usually, I judge based on the style of the invitation. Is it very formal? The more elaborate and formal the invitation looks, the more likely I am to get dressed up and assume there will be a chocolate fountain at the dessert table.