It's a baseball style jersey, but it says Giants on it in a large font and has the NFL Giants "NY" logo on it.

Closest I can find online is this one - https://i.ibb.co/wSF51P5/m-5d3502fb8557afe2e47e751f.jpg

But it's not the same, you can use google lens over that picture.

Just look up for giants ny jerseys.

They’re super popular so only a few teams are in stock and not all sizes.

Check these on amazon:

https://www.amazon.com/Ultra-Game-Baseball-Jersey-Shirt/dp/B07XLTT5W8?th=1&psc=1