Addressing attire on wedding invitations

Are there guidelines for addressing attire on my wedding invitation?

Simple Answer: You may include information on attire if it is relevant.

Generally, it is not the best etiquette to include dress requirements on your invitation. Your wedding invitation itself can allude to the dress code by its style. For example, if you are having a beach wedding and your invitation has a casual beach theme, guests would assume that casual attire is suitable. However, many people mention dress on their invitations if they feel their guests may be confused by what to wear or if there is a theme to the wedding. If you choose to address attire, there are a few options. A formal way is to print the description in small lettering in the bottom right hand corner of your invitation. A short and clear line such as “Black tie,” “Black tie encouraged,” “Semi-formal,” or “Casual” can be used. Some other options include addressing attire on the save the date card, reception card, or through word of mouth.

related question(s):
How do I make it clear that children are not invited?