That's weird. I'm also currently a 4 petite in most brands (sometimes a 2, which is ridiculous) but the clothes I bought in the 80s that I can still wear are 10s and 12s. Wonder why yours were 6s?

Still, my classic Jones New York silk suit that I bought in the mid-90s is a 6, and actually the waist is just a hair tight on me now. That's oblique development, not menopot. Yeah, right.