okay in simple terms for queensland weather you wouldnt need 12 ply or aran weight wool...it would just be too thick. I would stick with 8ply or what is known as double knit (same thing) for the wetaher up there. I prolly wouldnt go less than 8ply as you lose the absorbancy factor although some people swear by those Kozy longies that are a 5 ply wool. Does that help?