Yep, I'm going to have to think about the one pair of largest pants. And, in addition, I've also been thinking about going ahead and getting rid of all of my drawstring comfy pants, as well as my oversized pajama bottoms because I can buy smaller ones next year. This might be the best spring cleaning year I've ever had!
I've gotten rid of 5 large garbage bags of clothing. Some were donated. Others were given to family/friends. I had a few really nice things with tags still on them that I sold on Craigslist.
I would get rid of your fat clothes. I have heard from Weight Watchers even though I no longer go there, once you drop two pant sizes, get rid of them, but if you want to get rid of them after one pant size down, more power to you!
If you can, maybe get some clothes in your current size. You may feel more comfortable that way.