Good fit great price

I love these shirts

So I bought a large of this for my son as part of his Easter gift. He told me to washed it today, he took off the tags. So after washing it, I realized that it’s so big. Found out it’s XXL, but when we got it the tag and the size info that wrapped around it was large. So now I don’t know how I’m able to return it since it’s already washed.