The Duke and Duchess of Cambridge visited Centrepoint yesterday, and the informal visit showed that like her sister Pippa, Kate is rather partial to a polo necked dress. The dress was by Ralph Lauren, and was from the Blue Label Collection. A wool/cashmere mix, this dress had featured on Fashion-Mommy in November when it was shown in a post about Pippa’s blue polo neck dress. The dress is currently reduced at FarFetched.com, selling for £219, and is still available in sizes XS, S and L. The dress is also available from the Ralph Lauren Website for the bargain price of $159. However, Kate’s colour way is out of stock, and…