W.W.
there are some people who do NOT like used clothing. Period. End of Story.
HOW did this W. approach the other? Did she say "Hey - I've lost 50 lbs and these clothes don't fit me anymore - do you want them?" that would be a slap in the face.
If the co-worker comes up and says to everyone - I am giving away some clothes that I don't need anymore - please let me know who is interested? Then no one is being called out and no drama happens.