hey, thanks for your reply

sadly, with everything I do in the NPC replacer, I get an error  

but, after hours of time-wasting search on the internet I found a nice/noob friendly way to change clothes of NPC's,

this awesome hack by dizzy, enabling casual wear for NPC's
http://www.modthesims.info/download.php?t=76392
plus, christianlov's clothingrack:
http://www.modthesims.info/download.php?t=284411

now I have awesome npc's like ninja-cops and hobo-pizza-delivery-dudes

thanks for your help with the other one. I greatly appreciate it

I am looking for a hack that makes all my sims wear no uniforms
(including my NPC's)

does someone know where I can get this (sims 2) hack?

thanks in advance