You can take a high-twist fabric that doesn't wrinkle easily and simply don't have a front crease made. Some heavier cloths also do not hold a good crease but don't wrinkle easily, too. Also, if you are looking at photos from ads or websites, it's not surprising taht the trousers don't have any wrinkles.
Press them with the leg flat, like a pair of jeans.
I have a Jil Sander wool trouser without a front crease. I specify it every time I bring it to the dry cleaner: no crease. It doesn't seem to be a problem for them.
If you will notice, David Letterman wears his suit trousers without a crease. The trouser has to be pressed with a hand iron not on a pressing machine. Using the press would put creases on the outseam and inseam.