Britain's Princess Diana was "very proud" to wear thermal underwear.
The late royal - who died in a car accident in 1997 - enjoyed announcing she was sporting the warm undergarments, according to her fashion designer David Sassoon.
He said: "She was very proud of the fact that she wore thermals because she didn't like overcoats.
"When she was going into the fitting room, she would say, 'Just a minute, let me take my thermals off.' I think she enjoyed all that."
David's new book 'The Glamour of Bellville Sassoon' includes a thank you note Diana wrote to him after he provided her with a floral dress - a bright blue, short-sleeved number decorated with pink, purple, green and yellow flowers - which soon became her favourite even though royal advisors told her not to wear it.
David said: "She would say, 'I keep being told not to wear it, but I love this dress, my caring dress.' Of course Diana was the first member of the royal family to break all the rules."
The designer also praised Diana as a "red carpet glamour girl", claiming he would make more risque frocks for her to wear outside of the public eye.
He added: "They were for private use and a little more sexy, a little more fashion than what she could wear publicly at the time.
"Before her divorce, her clothes could never be overtly sexy. But just think how amazing she looked in the last years of her life. She was a red carpet glamour girl."
USA
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