"We are touching that yellow shirt."
Translation:Dotykamy tamtej żółtej koszuli.
Well... I'm afraid that you can't always trust the natives.
Using Accusative when Genitive is needed is a very common native mistake. And in some time, linguists will probably start to consider it acceptable. But right now, we still have to consider it a mistake. Especially considering the way this website works, comparing your answer with a list of correct answers.