Vintage University Of Texas Austin Longhorn Ringer T-shirt

Vintage University of Texas ringer T-shirt. T-shirt says " Big G ." The tag definitely shows it to be a true vintage T-shirt but I don't know much more about the item and it's age. I think it's from the 90s. Tag says Large but fits closer to a medium.  Please check against msmnts Underarm to underarm 18 Shoulder to bottom 24 The color is burnt orange and cream on the shirt. No major signs of wear, and I don't see any cracking on the letters. Very clean shirt