Board Thread:News and Announcements/@comment-3965346-20161125031709/@comment-26202330-20161127130933

Steven Bomb 17 wrote: Something happened sometime after Steven's birth to make them all regenerate, wow so Amethyst kept that form for at least four years, guess she wasn't too reckless during that time

I think Amethyst simply doesn't change her outfit when she regenerates most of the time. That is why they make such a big deal of her "finally" fixing her crooked shoulder strap at the end of that Slinker episode.