helmust lang and acne are a slim cut...they do not make one look slimmer...
actually...if you have hips...then you will have a serious problem with those brands...
unless of couse...you wear a long tunic with them at all times...
everyone i know swears by ag jeans...and even express...and of course seven...
look for a wash that is faded on the front of the thighs and darker on the inner thighs...this gives the illusion of a slimmer leg...i think a flare is also good as it balances wider hips and thighs...
flares should be worn with a chunky shoe or sneaker or a high heeel with a pointy toe......to anchor your silhouette...
check out mavi as well...i think they have decent styles and good prices...i also really like old navy's jeans and blue cult...
look for a slightly higher rise...but not super high...salt works is a new brand that has a higher rise...even seven is doing a higher rise now...
check out this site for most of what i mentioned...
http://www.scoopnyc.com/categorydetail.asp?CategoryID=1
another thing to look for is a pant that has a flap closure...the big button in the middle of your belly only adds bulk...a jean that comes across and hooks or buckles to one side with give you a flatter tummy...and who doesn't want a flatter tummy?....right?!?!...LOL...
good luck...hope this helps...