Whether you've just invested or about too invest in a pair (or you want to keep your jacket in good shape) taking proper care of your jacket doesn't hurt. Actually, if you take proper care, you can keep your favorite item in shape for a while (I mean a long time!). Start out by trying these daily steps and take it further when the season ends.
Daily Care
The daily care of your jacket can prolong the life of your piece immensely. So make these tips a habit.
When you need to straighten out the wrinkles use a high steam iron. Hang the jacket onto a thick hanger, use the steam (steam mode if available) and do not press the iron onto your favorite piece. Giving the wrinkles hot steam will do the job. Let it hang for a day.
Off Season Care
Jamming the jacket into your closet after the season is a mistake. I recommend taking it to the dry cleaners. But, not too often! (it damages the fabric). If you have water cleaning nearby you should go consult with them. They use a method that is friendly and helps recondition the fibers of the fabric back into its initial form. (translation => brings back that lust to the jacket)
Its only after cleaning you can hang it in your closet. Don't forget to give enough space in between the jackets. You don't want the jackets to be touching each other.