With children you should remember that losing a toy or, in this case, a cap, can be one of the most upsetting things the child has experienced in their life so far.
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As an experienced seamstress, I would say the more experienced the stitcher, the less likely they would want to do it. Those who sew know what it truly involves, and the hours, weeks, months of hard labor that go into a wedding gown, not to mention that quality fabric, makes a huge difference in the finished product and the price.