I remember someone saying (not sure which episode, though probably the same) that Eren lost his 3D Maneuver Gear after exiting his Titan form. I also remember seeing that myself, after exiting his titan form every time except the 2nd time he does (He had no gear on him, then, to begin with). So how was the girl inside the Female Titan able to have 3D Maneuver Gear on her, as well as a Survey Corps coat?
Note: I have finished watching the anime, but I have not read the manga. Please don't post any spoilers for me. Thank you :)