2nd reception dress

I've gotten varying opinions about this, but I wanted to see what you bloggers think:

Should I wear my wedding dress for my 2nd reception in Cali (a month after the wedding)
or
buy a fun white party dress?

The reception is more of a dinner party set up with 80-100 people and it's being held outdoors. I won't know 90% of the people, and I want to dress appropriately, but still bride-ly (that cannot be a word!)

I found Amanda Archer's dresses via Etsy and I was amazed. can you imagine these cute little numbers (all in white)!

White Cotton Dress

Pleated Collar Dress

Pleated Dress