Nice work getting here. Same spot for me before, and I hung onto the old sizes in the closet. When the weight crept back I already had things to wear so no immediate cost or hassle. Maybe not having them would have pushed me to stay on track though. This round I'm leaning toward giving everything to a shelter since people without housing need clothes they can't buy. If anything is nicer and still good you could sell it online to help pay for new stuff.
I just picked up my first 34 inch jeans in decades, since my twenties actually. Down 12 pounds from my target and 20 from what the doctor wants, so I'm excited, but now I've got a whole stack of jeans, pants and shorts in sizes from 34 up to 44. That's a lot of fabric I won't need if I stay here. I'm not keeping the biggest ones because I don't want to slide back, yet I've done the yo-yo thing before so maybe leave a size or two just in case? Burning everything past my current size sounds final, but Goodwill in town only wants lightly used stuff now and these have been worn hard. Not sure what stays and what goes.