Final answer:
The Chi Omega fraternity's first colors were cardinal and straw, and they were changed in 1900 to honor the fraternity's founders.
Step-by-step explanation:
The Chi Omega fraternity was established in 1895 at the University of Arkansas. Initially, their colors were cardinal and straw. However, in 1900, the colors were officially changed to cardinal and straw because of their association with the fraternity's early history. The founders chose these colors as a way to honor the five women who started the fraternity.