It's extremely frustrating! I postd this before:
http://www.3fatchicks.com/forum/look...surements.html and there's a link to a great article in it. It's for somewhat larger sizes than you wear but it's definitely still interesting to see the range of measurements for someone who refers to themsevles as a 10 or a 12.
What I keep saying is that manufacturers just need to list the basic measurements on clothes!!! The problem is, is that for most places the size charts are very, very off. According to Old Navy's measurements I should wear between a 12-14 and almost be wearing an XL by my bust size. However, I have M shirts there at are too big for me!!! I don't care what the number says but please at least match your size chart.
I'd much rather pants be sold as 28"waist 38"hip than by some arbitrary number 8. Then I could at least order online and not have to return anything.
Now, different manufacturers do have the right to pick their own set of measurements to cater to their audience. Some lines fit curvy women better, others might work better on a pear shape. If they'd just list their measurements straight up women would know where to shop and actually probably would have a lot more brand loyalty (and would order online more which would save them money in the long run!!!!).