The Birmingham grandmother who crocheted the intricate shawl chosen by the Camerons for their baby daughter's arrival at Downing Street said she was "absolutely delighted and honoured".
Jane Fraser-Cross, 74, posted the shawl on Friday along with a card congratulating the Prime Minister and his family on the birth of Florence Rose Endellion.
She said: "I wrote them a card and a little note that said 'I thought this would keep your precious bundle warm and cosy'.
"I wrapped the shawl in lemon tissue paper and thought that would be that, I hoped they would like it but I didn't expect to hear anything from them.
"Never in my wildest dreams did I think Downing Street would be calling to say she was going to wear the shawl for a public appearance.
"I am absolutely delighted and honoured", said Mrs Fraser-Cross, whose father served in the Coldstream Guards at Buckingham Palace.
The grandmother of 10, from Sutton Coldfield, spent five weeks crocheting the shawl, the first she has made in 10 years.
The fundraising mother-of-three, who likes to be known as "Granny Jane", said she followed a pattern that had been in her family for generations, adding: "My granny used this pattern to make me a shawl when I was a baby and my mother followed it for my brothers.
"I have used it a few times for my three sons and their children, and now for a very special and important little baby."
Mrs Fraser-Cross, who describes herself as "true blue", said she decided to send the shawl to the Camerons because she was impressed by their strong family values.