How to dress up a long sleeve baseball tee?

So I’m going to a big media event (with no actual dress code) for a popular tv show. These events tend to be more dressy however. I have an oversize baseball tee from the show that’s similar to the picture that I’d love to wear, but I definitely don’t want to wear jeans and a t-shirt.

What ways can I dress this up? I need some inspo. Right now all I’ve come up with is black flare pants, pointed flats or heels, and a blazer.