Walla Walla College students adopted orange and green as their school colors in 1924. The college’s orange color was sometimes described as “gold”.
Citations in the World Almanac (listed by cover date; color information is from the previous year): green/gold (1934-1935)
The Intercollegiate Bureau of Academic Costume (IBAC) must have assigned Walla Walla College a green hood lining with an orange chevron in the late 1940s or 1950s, which was how the lining was described in a 1972 IBAC list. Having said that, a list compiled by Kevin Sheard in Academic Heraldry in America (1962) described the green and orange shades as “forest green” (dark green) and “burnt orange” (dark orange), but this seems to have been an inaccurate interpretation of the college’s colors.