As an honorably discharged veteran (non-retired), would it be appropriate to wear your dress uniform to a funeral of another service member?

You can. I think that is one of the more appropriate times to wear it. I wont, but only because I am a bit wider around the midsection and cant button the jacket up lol.

Like others have posted. If you stand ready for an IG, don't know why it would be a problem. Show up with something out of line and an old Vet is going to call you on it and open up a can of worms. JMO

Yes