Party Dress

It's my birthday on Sunday - whoot whoot - it's the last birthday I'm celebrating until I hit 30 so I guess that is kind of exciting.  On Saturday I am having a birthday party and I need a birthday dress.  Suggestions ladies please!!  I want a new long dress except I am a tall drink of water to begin with and unless its a super long dress it looks like I'm wearing the pant version of clam diggers.  I went looking today and the options were not in my favor - everything seemed so picked over.  When do stores get in new shipments?  Anyone know?  Anyone have a great place/store where I can find the one? 

Thanks!!