From
answers.com:
Throughout the years, the Cowboys' blue jerseys have been popularly viewed to be "jinxed" because they often seem to lose when they wear them.[citation needed] Most of the time, Dallas will wear their blue jerseys when they visit Miami, Washington, or one of the handful of teams, such as the Houston Texans, Carolina Panthers, or the Tampa Bay Buccaneers, that traditionally wear their white jerseys at home during the first half of the season due to the hot climates in their respective cities. But on some occasions, opposing teams will purposely wear their white jerseys at home to try and jinx the Cowboys.
The Cowboys have lost the following playoff games when wearing their dark jerseys:
* Super Bowl V against the Baltimore Colts
* The 1980 NFC Championship Game versus the Philadelphia Eagles
* The 1982 NFC Championship Game against Washington
* A 1996 Divisional playoff game versus the Carolina Panthers
* A 2003 Wild Card playoff game against Carolina