When I was in grad school in the late 70's I wore a size 6 petite and weighed about what I do now. I was going through boxes at our old family home ( where me and all my relatives store way too much crap) and found some clothes from back then. I currently am a 4 petite. The sixes in the box fit about the same as my current 4s. So, it isn't a big difference. Ugly clothes though. Maybe then, like now, cheaper clothes were bigger than the more expensive stuff.
I agree with those who say that petite lengths keep getting longer. I now look for ankle pants because those are about right as full length pants.
Trek Madone 4.7 WSD
Cannondale Quick4
1969 Schwinn Collegiate, original owner
Terry Classic
Richard Feynman: “The first principle is that you must not fool yourself and you are the easiest person to fool.”