OKAY DID THE JACKET JUST FUCKING REGENERATE WITH THE DOCTOR IS THE JACKET LIKE MAGICAL OR INDESTRUCTIBLE OR SOMETHING WHY IS IT THE SAME
When the Doctor first regenerates, he’s in the same clothes he was in before. It’s usually later in that regeneration’s first episode that he changes clothes. Nine must have just decided that the jacket was useful.
I await the revision of everyone’s tragic headcanons that Nine’s jacket was originally Fitz’s.