Colin Kaepernick wore socks to a recent practice that show cartoon policemen done up as “pigs.”

Photos from Aug. 10 show the NFL lightning rod wearing the black socks adorned with the anti-police caricatures. Kaepernick wore the socks again on Aug. 12. One photo from the Aug. 10 practice session in San Francisco, which was open to the public, captures him walking onto the field with a raised fist.

The sartorial statement came prior to Kaepernick’s sit-down protest of the national anthem gaining attention during the 49ers’ preseason game on Aug. 26.

Kaepernick also had lodged his silent protest to “The Star-Spangled Banner” — designed, he said, to call attention to the oppression of black people and people of color in the United States — during the team’s first two preseason games, though he was not in uniform for those games.

Kaepernick has said he will continue to refuse to stand for the anthem in the future. He gets his first chance to repeat the protest in full view of the world on Thursday night, when the 49ers visit the Chargers for their final preseason games. It is “Salute to the Military” night at San Diego’s Qualcomm Stadium.

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