The period of dress that everyone is wearing in those photos taken in New Zealand is 1745 Jacobite , in which most people wore a mix of tartans anything thing that was available at the time etc. Most people these days wear victorian style highland wear ( apart from re enactors and kilt wearers in Oamaru ) that has many rules i.e which tartans to wear with what etc. The jacobite look is more over the top as you can mix tartans etc.