Congrats on your loss, Wanda! That is great news. It's so nice to see the rewards from being consistent, eh? I definitely hear you about pants troubles... I'm thick-waisted, so I need a bigger size for the waist, which leaves me with - you guessed it - baggy butt syndrome. But this wasn't so bad when I was thinner, so I'm looking forward to looking better in pants...and everything else.
Anyway, I do believe the 'correct' place to measure your waist is at/around your belly button - for simplicity's sake, I find it easiest to just measure at my belly button.