Oleg Cassini K200 Gown & Flower Girl Dress

I have an Oleg Cassini dress size 10. It has been worn once. It has been altered in length to fit me. I am 5 ft. 4n. W/o shoes and it was made to fit with small heel on. There is material left in the hem for it to be let out if needs be. I also have the matching flower girl dress however I am unsure of the size as it is still sealed tight in the box from the cleaners. I can tell you my daughter was 10 years old when she wore it and it was never altered. I have included pictures of us wearing the dresses as well as pictures of the orig. Ad for the dress. The dress is still sealed in the box from Wedding Gown Preservation Co. Where I had it as well as the flower girl dress cleaned and and sealed. It also has the tiara. Necklace ad earrings worn and as seen in the picture sealed in the box with the dress. It has a 10 year guarantee on its cleaning/sealing and was cleaned in May of 2005 so if upon opening it you see any damage they will fix it for free, However there was no damage or stains on the dress when I sent it in so that should not be a problem. My measurements at the time were 36,29,37. I still have the recps. And tags from the dress, alteration and cleaning/preservation as well as the garment bag it came in. I payed $1,500 for both dresses, alteration and preservation however I am asking $900 for both dresses o.b.o.
Thank you,
Gabrielle Armstrong