The author tweeted a picture of herself wearing the garment on Thursday as she gave her backing to a protest outside the Scottish Parliament.
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JK Rowling has photographed herself wearing a T-shirt calling Scotland’s First Minister a “destroyer of women’s rights”.
The author tweeted a picture of herself wearing the garment on Thursday as she gave her backing to a protest outside the Scottish Parliament over controversial gender recognition legislation.
The T-shirt read: “Nicola Sturgeon: Destroyer of women’s rights.”
Ms Rowling tweeted: “I stand in solidarity with @ForWomenScot and all women protesting and speaking outside the Scottish Parliament. #NoToSelfID.”
Asked by journalists about the post, a spokesman for the Scottish Government said he had not seen it.
Earlier on Thursday, a majority of MSPs on the Equalities, Human Rights and Civil Justice Committee recommended the general principles of the Gender Recognition Reform (Scotland) Bill should be approved.
The legislation aims to make it easier for transgender people to be legally recognised as their preferred gender.
Campaign group For Women Scotland hosted a rally outside Holyrood following the recommendation, with speakers including former Scottish Labour leader Johann Lamont and Maya Forstater of Sex Matters.
Ms Lamont told demonstrators that upon its establishment, the Scottish Parliament “was a Parliament where policy, where action, where law was shaped by an understanding of what created division and inequality”.