In both the comic and on the animated series 'The Invincible' Amanda (aka Monster Girl) can transform from her 12 year old looking human form into a large, male troll-like hulk monster. But in my alternate universe she can transform into a massive muscle bulk but still in her female human body. And here's she's testing out some new ultra stretch outfit from Rudolph Conners Onesie made for her. (BTW he's just standing there waiting if the onesie can survive her transformation either way its still a win for him)

Invincible Onesie - AUDIO VERSION - https://youtu.be/b-W0bAYp_Z0