My clothes weren't exactly falling off, but I know that after I lost about 12-14 pounds, I was able to fit in some clothes that were too tight before. Last year, I intentionally bought some clothes that were WAY too tight (like, I would never wear them in public when I was at that weight), but I was actually able to wear one of the pants I bought to work after I lost some weight!
I can't wait until I reach the point where my current clothes will be too baggy and fall off!