I've heard about vanity sizes, but this is ridiculous. For most brands, they have a chart for waist etc. measurements and the corresponding sizes. Let me tell you, for any jeans size I wear, I am ALWAYS bigger by at least 4 or more inches. Like, I just recently dropped a size in one brand, and according to their chart my waist measurement is too big for that size, and yet it's baggy on me!
For example.
Say the waist measurement of the pants was supposedly, I dunno, 30 inches. They'd be baggy on me even when my waist would be about 5 inches or more bigger!
So, the pants have a 30 inch waist, my waist would be 35, and the pants would be too big for me to wear.
Is that just vanity sizing? And does it continue into the smaller jeans sizes? (Like, if my waist measurement was 28, I'd be able to fit a "25" inch jeans waist? Or is vanity sizing less prevalent in 00-4 jeans?).
I'm very confused. If this is vanity sizing, it's out of control! IS that what it is? And if it is, that just makes it harder to find the right sizes...
Thanks for any input on this.

Yet, I sit here in my size 16 pants (that supposedly have 36" waists on them) and they are baggy!
I can even pull the waist out quite a bit and and the thighs/butt are really saggy on me. I also wear something like a 38F/38DDD bra from there but according to my measurements I should be something more like a 36I??? Yet my 38F bra's cup size is normally to big for me and the band is tight enough that it's hard to put on? 
