Congratulations!!
That's such an awesome feeling. It's my test for "retiring" pants. If I can pull them off (buttoned and zipped) without much effort, I'm no longer allowed to wear them to work. Too much possibility of a memorable moment.
Ya know... if you can pull them off while they're still buttoned, you might already be a size 18. You should go to the store and have a trying-on party!
cheers!

paula