Readers, I need your help. These jeans stink! Literally

So I purchased a new pair of black jeggings from Old Navy.  I still can't figure out how these are different from leggings but whatevs.  Anywho when I opened the package I was hit with a stank.  It smelt like burnt something and not like a good burnt something.  I figured all would be well once I washed my new jeans.  Nope, so very not well.  Now not only do my jeggings jeans still smell, every other article of clothing washed with the jeans stinks too.  I'm sitting here at my desk wearing a dress that I washed with them and I'm making myself nauseous from the fumes. 

Anyone know how to save these jeans?  Should I was them multiple times or Fabreeze them (and myself) to death?  I'll try almost anything.  Please help.