Not guessing. The uniform list annotates "NWU" on it. It doesn't specify type, which I was believed where his question was coming from. But yes, nothing should be purchase prior to NSI -- understood. Also, thanks for the info about not having to wear the NWU at NSI. That's a good tidbit of info, since it contradicts the site in saying that the UOD is typically NWU or Service Khakis.
The NSI link also give information for a lead RDC for any questions/concerns, which is what I was getting at re: a POC. Not having been selected previously, I can only go off what I actually know; what's in the instruction/web site and my own prior experiences in the Navy. Obviously, we all rely (gratefully) on prior selectees' experiences to fill in the blanks.