I was wondering if you ladies had an idea of how many sizes down a dress can be altered? I have my eye on a maggie sottero gown but I was thinking about buying it used, since I would be saving about a thousand dollars and right now I'm a size 8 but I just had a baby 2 months ago and I know by the time we get married in September I will be smaller and I am unsure what size I should get? If I am normally a 4 could an 8 be altered down to that size?