I am going to my cousin's wedding next month and have no idea what to wear. The thing is I will be 7 months pregnant and I really hate to go out and buy a dress I'll wear once (possibly it might get another use for Christmas parties when I'll be 9 months pregnant). So what should I do? The wedding is an outdoor evening wedding in Knoxville, TN in the middle of October. I have no idea what the weather will be like, but I guess they're not expecting it to be too cold yet.

What have I got in my closet?

Dresses:
http://i282.photobucket.com/al.....G_1134.jpg

http://i282.photobucket.com/al.....G_1128.jpg

Or I could wear this blouse:
http://i282.photobucket.com/al.....G_1148.jpg

with a black pencil skirt or a grey pinstripe pencil skirt. I also have a matching blazer to go with the grey pinstripe pencil skirt but I have no idea how to dress up the suit. The dresses are jersey and I can't help feeling like they are a little too casual but maybe I'm just not imagining the right accessories.

My aunt and uncle always throw fabulous parties so of course I want to look great too, despite being huge. What should I do? Do I need to break down and purchase something for the event or can I get away with what I have? If I do need to find something new, I don't even know where to begin. Thanks for your help.