You could study style for years, and still have scope to learn more. It’s an interesting topic that doesn’t always get the love it deserves, with some dismissing it as frivolous. We wear clothes everyday (although a duvet day now and then is compulsory), and wearing something you love can often change your mood. In homage to the dynasty that is style, this A-Z guide will bring you a little insider information on one of our favourite subjects, this week concentrating on all things Z. Rachel Zoe Rachel grew up in Milburn, New Jersey in 1971. After graduating from Milburn High School, she went on to study Psychology and Sociology at George Washington University in Washington DC. It was there she met future husband, Roger Berman. However, fashion was Rachel’s true love so they moved to New York City where she started to make her dream a reality. She became editor of YM magazine before switching to celebrity styling, gaining Jessica Simpson and Britney Spears as clients. Forty three-year-old Rachel has two children, Skylar Morrison and Kaius Jagger. Rachel Zoe pictured at Calvin Klein during New York Fashion Week Zara Spanish clothing retailer Zara was founded in 1975 by Amancio Ortega and Rosalía Mera. Flagship store of the Inditex group, the fashion group also owns brands such as Massimo Dutti, Bershka and Stradivarius to name but a few. Zara launches about 10,000 designs each year, itclaims it only needs two weeks to design a product and get it to its stores unlike the six month average. Zara's larest flagship store in Hong Kong Zadig & Voltaire Zadig & Voltaire, inspired by the Voltaire book, Zadig ou la Destinee was founded by Thierry Gillier in 1997. Thierry is the grandson of André Gillier, co-founder of Lacoste. A ready-to-wear label, Zadig  & Voltaire collections are widely recognised for leather jackets, jeans and boots. Accessible yet luxurious, the designs provide classic luxury. Gorgeous gowns and pretty embellishment also feature heavily. Zadig & Voltaire designs