pale blue long dress Unique Cross Sweetheart Light Soft-pleated Prom An open back ensures a flawless fit A-Line Sweetheart Light Blue Tulle

The bodice operates with strict geometry: a wide square neckline exposes the collarbone on both the front and the back

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What are some of your favourite ways to extend your lightweight dresses into cooler months

What Makes a Dress Formal

As laundering shirts used to be a tricky process, it was easier to have a separate collar that could receive special attention, as the body of the shirt would largely be hidden under the clothes

Kate wore Jenny Packham at the 100 Women in Hedge Funds dinner in October 2013 and again three months later at the National Portrait Gallery