What Nadia said (omg i love ur blend!)
For me they have to fit me like perfect...they can't be baggy in the thighs and tight in the waist or baggy in the bootay or anything like that... and they HAVE to be LONG enough, i have long legs so they have to be freakishly long to fit me lol....and they gotta be LOW...if the zipper is more than like an inch LOL i aint wearin' them.
But usually if i just try them on and they fit pretty good then i buy them, shrink 'em, and love 'em. Hollister, Express, and H&M are pretty good to me.
I can't wait to get my new rock star jeans from Hollister tomorrow!
EDIT: oh oh oh and flared like Mandy said...I like 'em flared, not bell-bottomish...ya feel me?