To crease or not to crease — flat front pants are sometimes manufactured with a crease, which was commonly reserved for pleated pants in the past. Do you want to add crease your existing pants? In order to create a long-lasting crease, the clothes are thermo-shocked, basically breaking the fabric threads at the crease line. After a while, you will notice a lighter color due to dye loss and micro-fraying that makes the damage more dramatic with every laundering. Avoid thermo-shocking your old favorite pants or jeans, and buy a new pair with creases to keep up with the current styles.