In the early days of TF2, things were different. Especially the spy and soldier. Their skins were probably the most different from what they are now compared to the other classes, in fact scout's skin has almost not changed at all. As you can see, the soldier used to have brown clothing (If you're on BLU, the color isn't that much different), has a red strap on his arm, has red pants instead of gray, and has a dark gray helmet.