Bra Issues

Ladies, I usually don't brag or anything, but I've lost 20 pounds and my bras don't exactly fit right. The band is too big but the cups fit fine. I was a 34DD and am now a 32DD, I've been going through my clothes and have started a box to sell or give away but have put my bras in a separate pile. Where should I take my bras? Most of them are Victoria's Secret but because I sweat throughout the day some have discoloration along where my underarms are. Any suggestions?