Hello and welcome to the forum. There are a couple of threads you might want to check into, there is one called "14 weeks til Christmas", where a bunch of us are posting our weight and keeping track of the pounds lost until Christmas. We started a few weeks back with a goal of a 30 pound loss by Christmas, but you can certainly join in. You don't have to lose 30 to join, you just have to want to lose weight by Christmas, so it's all good. You also might want to check out the 100+ thread, again there is no real weight loss requirement, it's just for ladies that will be at this diet thing for a while.
I had that same wardrobe last Christmas, sizes 18-24, so I know exactly where you are. Fitday is a great tool, and using it has helped me lose quite a bit, now that old wardrobe has been replaced by a new one in much smaller sizes.
Starting weight: 244.6 lbs. 10/01/09
Pounds lost: 80.6 lbs
Current weight: 164 lbs
Goal weight: 120 lbs
Weight to go: 44 lbs
Goal Date: 1/1/13