A turquoise wool suit worn by Margaret Thatcher on the day she was confirmed as Conservative Party leader has sold at auction for £25,000 ($39,010).

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Margaret Thatcher's suits on display at Christie's auction house in London. Picture: AP

A turquoise wool suit worn by Margaret Thatcher on the day she was confirmed as Conservative Party leader has sold at auction for £25,000 ($39,010).

An anonymous bidder bought the dress-suit by British designer Mansfield at a Christie's auction in London late on Monday.

The auction also sold six other outfits - worn by Thatcher in the 1970s before she became prime minister - to a buyer in South Korea.

Those outfits included a canary-yellow dress with navy trim and a matching jacket that the former leader wore to the Conservative Party Conference in 1975; a blush-pink outfit Thatcher wore in a BBC show in which she was interviewed on her skin-care regime; and a silver and gold cocktail ensemble.

The outfits fetched a little more than £73,000.