What should I wear to a 25th Class Reunion that denotes my military service?

Since you are wearing a T-shirt, why not make it one with a simple U.S. Navy printed across the back, or even better, in small letters on the left breast similiar to where you would have your ribbons? It would serve as a conversation starter with those classmates who are interested, or looking for a topic to discuss with you, but by keeping it simple and subdued, you don't look like a mobile billboard.

I myself don't bother...but my class had many enlisted and a field grade officer. but I have friends who wear the full enlisted Veteran regalia. Normally a service ring and lapel pin if formal. The reunions I've been to consist of how old, fat or bald everyone is and how great a few genetically gifted a few are. And in reality no one really cares if you served or not unless your single or another Navy Veteran spies you....now at the 30 to 40+ year mark you have the divorcees on the prowl for retired Vets. Normally t shits are worn for an event before or after the reunion ..but no SEAL team 6 or skull crossed m-16 rifles Vet ones... Now remember if you peacock... your F-18 pilot or SEAL classmates might be in attendance.