Ive washed my poly cotton a few times. It looked pretty good after washing on the delicate cycle with slow speed & cold water then hanging over night.
After a spaghetti dinner it needed to be washed again. I did the same routine. It had been hanging for about 12 hours. Today I thought I would press the pleats. Click image for larger version. 

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As I said, it looked pretty good after washing & hanging, but after only a few minutes with a steam iron it looks awesome. All the pleats came out crisp.
I want more kilts like this
The Lass did say I should get a khaki, black & camo