About the only thing you can do is try not to sit on the pleats for very long while they're wet. Your body heat combined with the moisture can introduce new creases or shift the existing ones. But if you do have to sit on them (say, for a long drive home), just be prepared to take it off and straighten the pleats back out immediately. You ought to be able to crispen up the folds with your fingers, and even use clothes pins to help hold them while you hang it to dry. If the pleats are beyond hand-straightening, you may need to get out the press cloth and steam iron. Unless you've really done some major damage back there, you shouldn't need to baste the pleats for this.
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