"A attractive day In Texas - 'ceiling and visibility unlimited, ' Mr. President", he wrote, in reference to the aviation code phrase for a desirable situation, one used by Bush's family and friends to spread the news of his death. His "thousand points of light" initiative honored the nation's volunteers.
George H.W. Bush will lie in state at the U.S. Capitol through Wednesday.
Bush's casket will then lie in state in the Capitol rotunda until Wednesday's memorial service at the National Cathedral.
The former president wore bright pink ones at apresidential library dedication for his son in 2013, and also sporteda red pair with his own face on them while accepting an award from the Lyndon B. Johnson Foundation in Houston that same year.
Bush's family, including his son George W. Bush, the 43rd president, and former first lady Laura Bush will be prominent.
Spokesman Jim McGrath tweeted Monday that Bush "will be carried to his final rest" wearing gray socks saluting the Armed Forces and paying "tribute to his lifetime of service", starting as an 18-year-old "naval aviator in war". His arrival at Ellington Field is expected at 4:30 p.m.More news: India vs Aus: Virat Kohli,Tim Paine pose with Border-Gavaskar trophy
After services in Washington, there will be another funeral in Houston on Thursday, followed by burial at the Bush Presidential Library in College Station, Texas.
The high court will be closed on Wednesday in recognition of the national day of mourning, rescheduling that day's oral arguments over Gamble v.
"I love you, too", his father responded, in his last words.
On Thursday, his casket will rest in a auto pulled by the locomotive during his almost 100-mile final journey from suburban Houston to College Station. We will cherish their time with us forever.
The train is scheduled to arrive in College Station on Thursday around 3:45 p.m. CST. Bush will be buried next to his wife Barbara, who died in April, and their daughter Robin, who died of leukemia at the age of three.
After going back to the White House after the inauguration, Bush says his chief of staff Andy Card took him to the Oval Office to see it for the first time as president. Earlier Monday, Trump had posted that he was "Looking forward to being with the Bush Family to pay my respects to President George H.W. Bush".