The crease that runs vertically down the front of most slacks—pants that aren’t chinos or denim—is there to add sharpness and sophistication to your look. This fold, also known as a traveler’s crease, helps keep your pants neat when you hang them in a garment bag as well. You’ll typically find them on work, semi-formal, or formal pants.

As far as ironing a crease at home, a good rule to follow is if the pants came with a crease, keep it. It’s there for a reason. But don’t be tempted to add one where there wasn’t one before. Not only is creating a permanent crease difficult to do at home, it also might not be appropriate for that pair of pants.

If you are ironing creased pants, lay them on their side so one pocket faces upward. Adjust so the original crease is folded, then iron and store on a pants hanger the same way. Most dry cleaners will hang pants this way, but you can specify “no crease” if you like.

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