The Patriots are the home team in the game, and their home jersey is blue. But as the home team in the Super Bowl, they have the choice to decide what jersey to wear, and perhaps they had their Super Bowl history in mind when choosing white.
XXXVI (20-17 win over Rams)
XXXVIII (32-39 win over Panthers)
XLII (17-14 loss to Giants)
XLVI (21-17 loss to Giants)
XX (46-10 loss to Bears)
XXXI (35-21 loss to Packers)
XXXIX (24-21 win over Eagles)
XLIX (28-24 win over Seahawks)
LI (34-28 win over the Falcons)
The team wearing white jerseys has won the Super Bowl in 12 of the previous 13 seasons.