Unnamed Area < change city >

I am looking for a dress by maggie sottero called kennedy. I think it's really pretty, and would love to try it on, but no one seems to have it either in NYC where I am or San Antonio,TX where my mom is. I tried to email Maggie Sottero, but it bounced back. I need to try it on before I spend any money. If anyone knows how I could get to try it on, that would be greatly appreciated! Also any guidance on the true sizing would be good (I am normally a 12, but the dresses that fit me have been 14-18). thanks!