My dress was purchased overseas, but if you know where to look in New Zealand, or have the time to order from overseas websites, there are lots of options for cocktail/formal dressing. I have found four different red dresses that will suit different body types.
ASOS City Goddess Maxi Dress with Ruffle Detail $88.94 - great for a rectangle bodyshape to give curves.
Moochi Fold Red Dress $359.99 - an apple, pear or inverted triangle could wear this shift dress as it has great asymmetric lines to draw the eye to.
The Iconic Bec & Bridge Decadent Dress AU$220.00 - for a rectangle bodyshape choose a shrug or bolero to add proportions up top and give you definition.
Portmans Lucky in Love Lace Dress AU$149.95 - great for an hourglass to highlight those gorgeous curves.
For more on bodyshapes check out my page, Dress for your Shape.