If travelling during the winter, make sure to pack some of the following. The winter months are June, July and August, and the temperature can drop to minus degrees in certain parts of the country. However, the average will be around 12 -16 C in most cities such as Auckland.
A good waterproof or windproof jacket is great to have along with you. Multi-purpose clothes will always be more useful. A hoodie with a zip-up. Fleece during windy days, thermal leggings and underwear, socks, hand and foot comforters, a beanie, warm scarf, and gloves. A few warm t-shirts and jeans. Hiking bottoms, and a nice dress for an evening out!
For summer months, take some long-sleeved shirts and t-shirts, as the New Zealand sun can be damaging. T-shirts, dresses, jeans, shorts, plenty of socks, hiking bottoms, sarong, a swimming suit, neck warmers, and a pair of gloves.