Explain why I can't use my PvP Rewards?

[Colorful]

Explain all that casting/tank gear that Neverreap insists I have constantly then

Also
If I buy a SMN Eso piece right now, which I can do because my Bard is to 60, I still wouldn't be able to use it because my ACN class is only 57.

This thread can also be titled (in my case): "Please let me use Ironworks Monk gear on my lvl 15 Pugilist, thanks"

I don't get what point people are trying to make with this, don't you still need the class at 60 to use their PvP gear? I can't wear Monk PvP gear of my Ninja Job.