Navy Crazy

My brother-in-law recently got engaged and I am so excited to be in their wedding! They decided on navy blue as their main color, so I've been searching high and low for a pretty navy dress. Unfortunately when I find one I like, it's too short, too expensive, my size is sold out, etc... So I'm struggling a bit! 
I also don't want to look too casual or too formal compared to everyone else, you know?! Do you guys have any recommendations of where to find a cute, summer-wearable, affordable, navy dress?!
Below are some dresses I've been looking into getting... hopefully some of them come back in stock n my size!
Click on the images below to get you to the product page!

XOXO