I agree with Kim!!!
I used to keep the larger sizes "just in case", and instead of having a closet full of clothes, I had a closet full of sizes!
This time there's no looking back. I will be donating, ebaying, gifting, whatever- to make room for newer, better fitting garments.
Right now, I'm between sizes, and about to run out of clothes. My closet housed sizes from 18 to 24/26, but I'm wearing the 18s now, and soon I will have to get new things.
Not looking forward to buying things I will also eventually outgrow, but that's part of the acceptance we have to teach ourselves as part of this process - in my mind it's the same acceptance of buying a meal out, and leaving the better portion of food on the plate, even when taking the rest home isn't an option.
If the clothing was so dear to you due to the expense, ebay it and recoup what you can. Maybe you'll find someone selling a smaller size of what you want at a fabulous price. I wish you luck and peace as you come to a decision that will make you happy.