That is incredibly valuable information about the urgent need to wash new clothes !
I had been feeling I should do that for some years. But I didn't imagine it was so needed. I vaguely thought about
how many people have touched that particular clothes item and from that I took to this habit.
When young, I naively assumed everything from a store was as clean as could possibly be.
I rarely have washed new clothes twice, but I do tend to wear them once after a good wash and then give a thorough second washing. I think from now on I will wash them TWICE at the outset !
Eww, terrible !
The chemical component is really alarming, especially what you said about the yarn you received.
[ Isn't that infuriating to keep drying so many times and get little result ? ]
By the way : I recommend drying everything OUTDOORS in fresh air with sunlight, preferably.
I suspect the sun eliminates all those bacteria, germs and other awful things. There may be some even that
no one has yet discovered but which are a serious threat.
++++++++++++++
After reading the article :
I see that several of the commenters mentioned this idea of drying items out in fresh air and sun. 
One person even added, 'even in winter'.
That is exactly what I do. When it's cold but sunny [even with snow on the ground which imparts a feeling of purification], hang the items out to dry until they start to freeze solid...!
This applies to sheets and blankets, too ! All the more important for them to receive this careful treatment.
This paragraph from Maria's article is appalling :
"What types of illnesses could you potentially get from trying on contaminated clothes?
 
Organisms that cause hepatitis A, traveler's diarrhea, MRSA, salmonella, norovirus, yeast infections and streptococcus ....[come from] clothing items tried on by multiple people."
http://articles.mercola.com/sites/artic ... acebookdoc