University Co-op spokeswoman Casey Ellis says the 13,000 shirts and 1,000 caps were to be shipped Friday.
Ellis told The Associated Press that the items, printed to hail a UT victory, were made a day or two before the Jan. 7 game in which Alabama beat the Longhorns 37-21.
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Ellis says the shirts retail for $20 each, while the cap price was $22.
She says the University Co-op is working with charitable groups to have the donated apparel transported from Austin and distributed in Haiti, which was devastated in the Jan. 12 quake.
The co-op is the main distributor of UT Longhorn merchandise and apparel.