When I purged my room of clothing sewing projects, I bagged individually each unfinished project with the pattern, etc. Labeled it well and dropped all at Goodwill. I won't know what happened to it, so what I don't know doesn't hurt. Someone may find something like that a treasure. Or they may just discard it at the get go. All I know is that it's not taking up space in my closet and it's not pressing on my mind with guilt feelings.