Former President George H.W. Bush wears socks with his image as he sits in a cart on the sidelines before an NFL football game between the New England Patriots and Houston Texans in 2013. David J. Phillip/Associated Press

Former President George H.W. Bush crosses his red white and blue socked feet during the unveiling ceremony of former President George W. Bush, his son, and former first lady Laura Bush's portraits in the East Room of the White House. Carolyn Kaster/Associated Press

George Bush wears American flag socks as he presents roses to new Houston Texans cheerleaders during a ceremony in Houston. Smiley N. Pool/Houston Chronicle via AP

Former President George H. W. Bush, in a pair of red and white socks, is wheeled off of the stage to sit next to President Barack Obama after presenting the 5,000th Daily Point of Light Award in the East Room of the White House in 2013. Susan Walsh/Associated Press

Former President George H. W. Bush, in a pair of red and white socks, participates in an award ceremony with President Barack Obama. Susan Walsh/Associated Press

George H.W. Bush wears a pair of striped socks to a ceremony for his Thousand Points of Light initiative in the East Room of the White House in this July 2013 photo.

Former President George H.W. Bush wears a pair of his trademark wild socks at the dedication of the George W. Bush presidential library in Dallas in April 25. Associated Press photo

George H.W. Bush's socks are a little more subdued in this sideline photo. Tony Gutierrez/Associated Press

Former President Bill Clinton points to western-themed socks worn by former President George H.W. Bush at Bush’s home in Kennebunkport during a visit last month. Bush has donated the socks, an autographed picture of the moment and a signed letter of authenticity to a charity auction for the Roman Catholic Diocese of Portland. The Associated Press/Clinton Foundation via the Roman Catholic Diocese of Portland