As a military spouse, you will receive invitations to various social events, both military and civilian. This is a wonderful opportunity to meet new and interesting people. Attire is usually specified and can range from informal to formal, depending on the time of day and geographic location. Here is an example of what to wear when the invite says “Service Dress Uniform”.
When in doubt, call your host or someone who has been to a similar function to ask what is appropriate to wear. For more information and details on what to wear, be sure to download Naval Services FamilyLines Guideline Series, "Social Customs and Traditions of the Navy".