Do you anticipate changing dress sizes between now and when you think you'll need the clothes again? If you think you're going to have to replace your wardrobe anyway on account of that...then maybe let some of the things go?
As for me, I'm keeping everything. I'm a hoarder. A2 is warned.
Sometimes I lose weight; sometimes I gain it -- but the clothes generally fit the weight I always come back to. I'm tempted to keep them. You'll know I need to do laundry if I show up to class wearing a tea length skirt.