Eagles usually wear tri panel against the swans in Perth.
Interestingly, in 05 and 06 QF at subi, eagles wore tri panel but when the teams met a few weeks later in the GF they wore full royal.
2005 Qualifying final we wore the tri panel with the flying eagle and in the 2006 Qualifying final we wore the full royal wings. We were the away team in both grand finals I believe judging by the tv scoreboard with syd above wce. They say that the wings are our traditional finals strip yet in 2011 semi final against carlton we wore the tri panel with white shorts over a full royal kit which would've made a much more visually appealing and non clashy game to watch.