This makes me crazy. I have so much trouble finding clothes that fit anyway, since I'm petite (and not all that short, but my proportions are definitely petite).
When I was in high school, I was 5' 4" and weighed 100 pounds and was a size 3/4.
35 years later, I'm still 5' 4" (probably--haven't measured my height in 20 years and people do shrink as they get older

) and I weigh 125 pounds and guess what size I am?? Yup, size 4 (or 6P).
When I get down to 115-118 pounds (what I consider my ideal weight) I also go down a size and can't find a darn thing locally in a regular size 2 or a 4P.
It's just crazy, 'cause I know I'm not that small--where do all the really tiny people shop?? I end up buying most of my clothes online.