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Much more difficult than the 'beautiful Mrs. Graham'! I even had to do a little research :) I'm guessing Lady Alston??
Either Lady Sophia Sheffield or Mrs. Edmund Pleydell? This is a tough one. Those are the only two portraits I have that bear any resemblance.
My money is on Lady Alston. One of the few instances I can think of in Gainsborough's work of white-over-blue, rather than the reverse.
It's Lady Alston or http://www.google.com/m/search?q=thomas+gainsborough&aq=0&oq=thomas%2520gain&aqi=g5-k11d0t0&fkt=2095&fsdt=40742&csll=&action=&site=images&gl=us&source=mog<oken=6af83b78#i=134.Gainsborough is on my list of favourite painters along with Thomas Lawernce, George Romney (if that's how his name is spelled) and Elisabeth-Louise.
The Duchess has it.but that was a tough one. He painted so many ladies in blue.
I can't get anything past this crowd! It's true, Lady Alston it is.
Please give us a hard one, LOL!
I'm more a Reynolds :)
I know those skirts!