I think you can try visiting Robinsons in The Gardens.

Their men's department has this section with lots of pants (near the cashier counter in the center part, you won't miss it) I just went there yesterday and got myself a pair of really nice slim cutting pants.
The brand is John Harold London, I personally have not heard/seen this brand before; apparently it's in Robinsons only. The brand is not even Google'able

The one I got was really nice and it cost about RM150+ after discount. Since it's a contemporary slim cutting, I had to size up a size; and the cutting and fit is really nice!! The material is superfine teteron rayon, I have no idea what it is or if it's any good but it does feel good
I don't know if the price is a rip-off, but I have been hunting nice slim formal pants for my internship and this is the first time ever I have tried on such a nice pair of pants!!

All the best in your hunt