It does have that look to it, it looks to me like something a waiter or porter would wear. The confusing thing is that it is named to a sailor that I know was at least a Pharmacists mate 1st class before becoming an officer, I think a LT (jg). Where does a jacket like this with ARMY buttons enter into that? So far, I haven't been able to turn up any military service of family members, but my research is still preliminary. There were a few other items in this group that dont quite fit, a WWI Army pouch and a framed photo of what appears to be an old fixed landing gear biplane. That photo is in a NAVY frame. I am hoping that by understanding this uniform, the rest might make a bit more sense.
Thanks,
Travis