The Shifter PrC

[Hypersmurf]

So you can Wildshape yourself first and all of those bonuses would apply and then you can Shapechange into something else and you'll still be Wildshaped and have all of those bonuses.

Natural Spell and Wild Armor don't say "while Wildshaped", however - they say "while in a wild shape".

When you use Shapechange, your Shape Changes. If your shape is that of a giant Ice Paraelemental Octopus, you are no longer "in a wild shape", even though the duration of your Wildshape has not expired.

If I cast Ethereal Jaunt, move over to the Ethereal Plane, and then cast Plane Shift to travel to the Abyss, then even though my Ethereal Jaunt spell is still active, any abilities I have that function "while ethereal" are not active... because I'm not ethereal. Any abilities I have that function "for the duration of Ethereal Jaunt" still work, because that duration has not expired.

If I'm not "in a wild shape", the duration of Wildshape is irrelevant to Natural Spell and to Wild Armor.

-Hyp.