So the ebay seller finally got back to me. She said because shipping costs so much for the both of us, as the costume came from China, it would not be worth returning it and suggested I see a tailor. I unwrapped the jacket again and sure enough, there are seams available on both the back and on the sleeves for the tailor to hem to suit my needs. Tomorrow I will go to the local dry cleaners and see what can be arranged, but if not, there is a tailor that specializes in prom dresses and suits that could help for a hefty price. I was angry earlier because I felt so ashamed I did not think it through...but at least hope is not lost! No need to throw away a good costume just yet...I think once it is tailored and I see how good I look in it then I will fall in love with it...but right now I am still a little glum because I have spent so much money...