I have started my search to try to pin down the century our girl lived in. So where better to look than the internet.  I found a website called historyofeuropeanfashion.wordpress.com produced by an author called abigailwestover94. She describes a shift in fashion in the 18th Century driven by the Enlightenment and of course the wild excesses of the French court with characters like Madame Pompadour and Marie Antoinette. The Rococo style was “light and happy” with pastel colours. The chemise a la reine was a loose white gown with no corset and a colourful silk sash around the waist.