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I am so sorry you have had such a bad experience. I think you have to be the better person and let it go. I assume you have a child in this school. The skirts can go in the costume collection and you can chalk it up to poor communication. I have been through a lot of these
as an art teacher and mother of a musical theater kid. Also made 4 prom dresses for girls whose mothers were not on duty. Stepped in at the last minute to finish a class quilt when the other mother got too busy. It's part of being a generous parent. Hopefully your child will value your effort. Have a good excuse ready for the next time.
My youngest is 21 and about to graduate from college. I had forgotten that 5th grade quilt, costumes, prom dresses.She's a wonderful, generous girl. She learned that from me.