This article mentions the findings of Dr. Bill Johnson.

Women that have liposuction below the waist, about 48 percent of those will see an increase in breast size following the procedure

That about 50% of women that undergo liposuction can end up with larger breasts:

For me, it was my outer thighs and it was always something that I had to deal with since I was in college, I went from an A to a B.

Explains Taylor Duval.

Now, it is pretty weird to hear about this correlation and only this specific case out there. What makes more sense is that women that get liposuction from their waists can end up with a smaller back, which leads to a step down in bra band size, thus a bigger cup size.