Jesus christ, its common for teams to do such, I'm fairly sure with the Real vs Valencia final I saw the highlights of the other day the entire team, not just those who played, went out in their home kit(they played in the away kit) to receive the trophy, its fine for the entire Utd team to do it, a Chelsea player does it, lets all use it as a chance to have a go at Terry.
I dislike Terry, immensely, but there is entirely nothing wrong, strange or different to players putting on the team kit. its a uniform, its what they all play in and you can pretend all you like but Terry is a huge part of that team, he's the captain, he's been part of the mentality and strength that has meant they've won final after final after final.