I wear all of my buttons to every competition on one of my old Brownie or Junior vests from Girl Scouts. I had to switch to a junior vest for the Philadelphia Regional because it had more space and I had to many buttons!!! I like when people come up to me and try to find their button and then realize that I have 3 years worth of their buttons on my vest!
Random button story: At the NJ Regions one guy was giving out Free Hugs and I had a MOE Hugs buttons from the year before so I gave it to him ^_^ One less button for me but it was for a good cause!!!!
That's me with my Brownie vest of buttons at the NJ Regional... I couldn't fit all my buttons on it so I had a bigger vest during the Philly regional and yes the entire back(and some of the inside) is full of buttons... It's a suit or armor!!!
EDIT: And I've never been to Atlanta *tears* So all the buttons I've collected are from Regionals and Off-Season events and I think I have a pretty nice amount for only Regionals and Off-Season!!