Not too contrasting, but Felix Potvin wearing his Leafs gear when he first joined the Islanders and wore #55:
Dafoe with the Trashers has some generic colored gear. I know he came there after playing for the Bruins, so the silver gear is kinda odd but he was unsigned before joining them:
Huet when he was traded to the Caps from the Habs. Habs gear with Caps: