Here's my situation, the dress I want my girls to wear is a copy of a dress that my mother had worn when she was 16, when she met my dad. It's fairly simple vintage dress (just has some elaborate pleating around the neckline)from the 50's. I spoke with a seamstress, who said that she could make the dresses for about $200 each. I've never had a dress made to know if thats a good price or not. My MOH and one BM both said thats reasonable, the other two are my FI's sisters and they weren't too thrilled with the price.
Now that I've got this dress in my head, it's really the dress that I want the girls to wear. More so for sentimental reason's, I wore that dress on my 18th birthday to visit my mom in the hospital(she passed just before my 19th birthday), I just feel that it would be a wonderful way to have her there with me.