Steam has the properties of smoothing out wrinkles. Put your garment on a hanger. Go into the shower and hang it on the shower rod. Make sure that it has maximum exposure but is away from any water splash which will ruin everything for you.
Turn on your shower at the highest heat and come out of it. Close the door and let the shower run for ten to fifteen minutes, depending on the garment. Hard garments demand greater time. Go in and check for the wrinkles. Give it more time if the wrinkles remain.
If steaming does not work, resort to this option. Your hair dryer can be put to another purpose. This method works best when the clothes are slightly damp and the material is fabric. Place the garment flat on a surface with all the parts spread out. Blow dry all the parts of the garment at a small distance from the cloth. Work slow and steady to all parts.
If any of the above options do not work, take a damp cloth to the garment. Lay it out flat on a surface with all the parts spread out. Dip a clean cloth in hot water and scrap it over the garment while stretching it to make it taut. After you apply the damp cloth to every part, hang the cloth in a hanger to dry and wear after that.