if it was stored in a basement, you want to wash it anyway. it's probably full of dust and mites. just be sure and use a washer bag for the smaller pieces and serge or zigzag the edges on the larger ones.
i always found the soda/vinegar treatment to work on all kinds of smelly things, so that's where i would start. if that didn't work i would separate out the whites and (gasp) bleach those. for the colors i would use borax or ammonia with my detergent. at that point you have nothing at all to lose anymore. you can test for colorfastness and use bleach on anything else that's colorfast. i'll be more than you think. whatever still smells, get rid of it before it smells up everything else.