Donielle Brooke is the founder of the online fashion business Designer Wardrobe, an online marketplace where where users list, buy, sell and rent designer clothing and accessories. The business now has 100,000 members, and has opened a physical store in Grafton in Auckland, where customers can try on rental outfits for special occasions. Last year it crowdsourced nearly $2 million over several days - to improve its technology platform and build the business. Spark's CEO Simon Moutter and GrabOne founder Shane Bradley are directors of the company. Donielle tells Kathryn her idea was born out of adversity when a cancer diagnosis forced her to sell her clothes.