Not only do the waist sizes vary from each manufacturer, they vary from jean style to style from the same manufacturer. I like Levi's 510 super skinny and 511 slim. Both waists fit differently. Not only that, I have like five pars of 511's and every one of the waist fit a little differently, even though they are all marked 30 waist. My 511's have almost two inches difference from each other.
yea
Yes.
yes
I went on a site on this topic but can't remember the name, If I'll remember I will let you know.
In reality, no. Each jeans maker does it just a little differently; a size 30 in Levis will not fit like a size 30 in Hollisters. Most times the tag size doesn't reflect the actual waist size of the pants; a size 30 by one jeans maker actually measures out to a size 32 while another might be spot on.
In theory, yes, but each brand of jeans fits differently. I'd try everything on to be sure. :)
No
