Removing Dusty Smell from a Crocheted Robe?

There is a dusty smell in a recycled sweater-like robe I bought at the thrift store. I have washed it, but let it air dry. It is like a crocheted sweater type material that probably would not do well in the dryer.

It is white so it could be bleached. It just smells so dusty you cannot wear it. I do have allergies. Thank you so much.

By Dianne D.