Toddler pullover sweatshirt sz xs

Super cute sweatshirt. It says "Look Pretty Play Dirty Dune Crew Ladies" on the front. On the arm, hood, and back, it says "Dune Crew Ladies." I got this for my daughter when she was about 3. I'd say it's about a 4T? The tag says xs, but it definitely wouldn't have fit her past 5. The company is Port and Company (Core Fleese). Maybe you can see if they have some sizing guidelines. I think she wore this one time for a photo because I got a matching sweatshirt. When I bought it, I didn't realize that she was going to refuse to wear pullover sweatshirts. She turns 6 soon, so I've been packing around this sweatshirt for a few years. It's been washed a handful of times... just to get dog hair off. From dog friendly home.