Anyways, the story was that the artist felt like DCs editors basically ignored him and his work and that he made her bust slightly bigger each issue. But as pointed out it's mostly been debunked. But still a funny story.
View attachment 2400619
Just to completely kill the myth that "Wally Wood increased PG's bust size every issue, starting out small and ending up huge", this is her first appearance in All-Star Comics #58 (1976).
As you can see, she was drawn with a big chest from the start. Not much different from the Amanda Conner artwork in Sinner87's post.
Wally Wood, artist and co-creator of Power Girl, took his life just 5 years after this issue was released. He lived a troubled life, suffering from alcoholism and deteriorating physical and mental health.
It appears the myth really took off when Jimmy Palmiotti, writer on the 2009 Power Girl series, repeated it to a journalist. Where he first heard it is unknown. The problem is that Palmiotti only got into the comics industry a decade after Wood's death, and was repeating someone else's bullshit, as the panels above prove. At this point Wood had been dead for nearly 30 years, and was obviously unable to debunk it himself.
Below is a great video that showcases Power Girl comic panels from the 70's and 80's, debunking the myth and pointing out that she wasn't even supposed to be notoriously busty compared to her peers until Justice League Europe (1989). A horny Flash (Wally West) would often hit on her (with PG angrily rejecting him), establishing her as an in-universe sex symbol.
It's worth noting however, that comic book artists don't follow some absolute measurements when drawing, they're basically re-using the same few body types over and over again. Unless the comic specifically adresses PG's breasts, they will be drawn the same size as any other woman in the comic. And most comic artists draw busty, idealized women. So art-wise, Power Girl isn't really anything special compared to other superheroines.
