Don't hang tough. Take dry-cleaned garments out of the plastic as soon as you get them home, so the fabric can breathe. Also, remove clothes from flimsy wire hangers, which can leave them misshapen.
If you prefer to hang your trousers full-length and you have the vertical space, use this sturdy clamp hanger. Attach pants at the waistband to avoid creases. A set of six costs $9 at Organize Everything.