"Φοράω το λευκό πουκάμισο όταν ασκούμαι."
Μετάφραση:I wear the white shirt when I exercise.
What are you referring to?
If you used *this * instead of the, I'm afraid it's not the same thing. Αυτό is missing from the Greek sentrence, so it can't be translated this way.
If you are referring to something else, please let us know and be a bit more specific.