Wash the uniform in the washing machine or by hand. Set the temperature to "Cold" and the cycle to "Gentle-wash." Wash the uniform with like colors, or wash alone, but never wash polyester with towels or blankets.
Remove the uniform from the dryer while it is still damp. Hang the shirt up to finish drying on a standard hanger and the skirt on a skirt hanger. Place the uniform in an area with low moisture to complete drying.
Hang the uniform in the bathroom while someone showers, or turn the hot water on and let it run. Close the bathroom door to close in the steam and leave alone for 15 minutes. Wet your hands and smooth the fabric of the uniform by pulling it downward. Repeat wetting your hands and smoothing over the fabric for five minutes. Leave the uniform hanging for an additional 10 minutes.
Transfer the uniform to a professional grade steamer to help remove the wrinkles if the shower does not work. Hang the uniform and hold the steamer wand 6 to 8 inches from the uniform. Glide the steam over the polyester to smooth out the wrinkles. As you steam, use your opposite hand to pull the fabric downward.
Iron out tough wrinkles. Flip the uniform inside out and set the iron to the polyester setting, or medium-heat. Glide the iron over the back of the uniform until the wrinkles are gone. If the top or skirt has pleats, then flip the skirt to the right side and iron the individual pleats. Be careful not to hold the iron onto the polyester too long to prevent burning or discoloring.