Detailed historical information about the red and gold school colors of the University of St. Thomas is not available at this time. A medium shade of “true” red appears to have been more commonly used during the university’s history. That said, the school seal of the University of St. Thomas reproduced above uses scarlet (bright orangish-red) and old gold (brownish-gold).
The Intercollegiate Bureau of Academic Costume (IBAC) probably assigned the University of St. Thomas a hood lining not long after the university was founded in 1947. A list compiled by Kevin Sheard in Academic Heraldry in America (1962) stated that St. Thomas’s hood lining was scarlet with a gold chevron, which was a duplication of the hood already assigned to Lancaster Theological Seminary. But an IBAC list from 1972 avoided this duplication by assigning St. Thomas a hood lining was cardinal with three gold chevrons.
One should note that Sheard described the university’s hood as a bright shade of red (scarlet), not the medium shade of red (cardinal) cited by the IBAC. Here the medium shade of red has been used.