The Caps did it in their inaugural season, the experiment ended after half a season due to sweat stains. They were standard in the early days of hockey, when pants came in two colors, white and natural canvas. They were gone in the NHL (apart from the Caps and the later one offs), at least, by 1930, though 5 of 9 teams were still using natural. The Black Hawks were the first to use dyed pants in the NHL, when they came into the league in 1926. The Maroons in 37-38 were the last to use the natural color as a team, and the last use I can find was by the NHL All Stars at the Babe Siebert Memorial Game in 1939 (versus the blue pants-ed Habs)