Bilateral mastectomy support group

I had a bilateral mastectomy 7 yrs ago. I chose not to have reconstruction and I don't wear prosthetics. I gained a lot of weight during chemo and have a terrible time losing any at all - - so my body looks terrible. the people who love me still do, but I do wish there were clothes I could wear that didn't have big gaps in the front where boobs are supposed to be. I can't go to a wedding this weekend due to '"black tie" and I cannot find a cocktail dress in a size 22 (for the waist down) with no huge gaping front. Is there anywhere anyone knows of for clothing with a flatter front that aren't for men?