So it is finally official, the news that all fashion lovers already knew, Duchess Kate is great for the fashion economy. As well as helping companies like Reiss to show huge profits thanks to her patronage of their brands, Kate has helped dresses, fascinators and nude coloured tights to become much sought after items and has guaranteed an instant sell out of any item she wears, or is reported to have bought. This week  Kate took a shopping trip to Chelsea’s Kings Road and visited boutique Anonymous by Ross+Bute. She made the most of the sales by purchasing this purple jewel collared v neck top, reduced to £84.50. Of course,…