جاكيتَكَ or جاكيتُكَ ؟
None of them, it should be مِعْطَفَكَ.
جاكيتك Is not correct at all
They are just writing the English word in Arabic letters.
The correct one is "jaakiituka" or "mi3Tafuka" according to Standard Arabic. (Note: "jaakiit" is a borrowed word from English and not Arabic.)
However, some dialects use "jaakiitak" or "mi3Tafak".