Is it permissible for a married woman to wear a wig if the hair was sacrificed to an idol or foreign deity? There is a temple in India, dubbed the "Richest temple in the World" where pilgrims shave their heads as offerings to their god. This temple supplies the top wig and hair extension manufacturers. If it is not kosher to eat food sacrificed to an idol, is it permissible or not to wear hair sacrificed to an idol since you're not ingesting it?
This was a very hot topic several years ago when some it became known that many wigs from India have hair that comes from idol worship. For a comprehensive treatment of the subject see Rabbi Yirmiyohu Kaganoff's article "Can a Sheitel be Prohibited Because of Avodah Zarah?".