I would sew before washing.....sun and fresh air first............sprinkle with baking soda and use the fabreeze.......then sew and then wash
:D If you have a covered porch that would be good for it :D
I found this on internet it says mold causes the smell so......................
Kill the mold by soaking the clothes overnight in a solution such as ONE of the following:
One cup ammonia to one gallon warm water; or
One cup of white vinegar to one gallon warm water; or
One cup of baking soda to one gallon warm water
Soak overnight.
Wash normally with regular detergent and hang to dry on a sunny day.