T-shirts appearing vintage and worn is an ongoing trend. You can do it yourself but hey, I did it already for you. A tat worn Vintage Birdie even your mother would love it.
Distress for less DIY budget tip: Bury your T-shirt in the yard for a few days. Cotton and wool seem to respond best, and for really distressed clothing (such as for Halloween or a spooky role play), add rotten pond water and leave for a few months yeuch… That’s entirely your choice :)