With the lettered shirt, just keep in mind that you're not in college anymore. I don't think I would buy her a traditional letter shirt to start. Some alumnae are weird about wearing them, and in the NPC world, they're generally seen more as a collegiate thing. Her age may also dictate what she would like.
A shirt that's more "adult" with the sorority name spelled out might be a better option.
Just my 2 cents!
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