Let them go. In the event you get back to a size 10 or 12, you will probably want new stuff. And the real problem with storing clothes for a long time is that if you aren't careful they will get faded crease marks, moth holes, you name it, and by the time you can wear them (or give up on wearing them) they will be unwearable anyway.

Give them to a battered women's shelter is my suggestion. Nice clothes, especially suits are always hard to come by as donations there.