Suppose a married woman is able to create a Sheitel that is entirely made up of her own hair (detached, of course). Does that satisfy the requirement for covering her hair?
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This is a matter of disagreement among the poskim. Those who say this is an acceptable type of hair covering include Shiltei Giborim (Shabbos 29a in dapei haRif) and P'ri M'gadim (Eshel Avraham OC 75:5).
Those who say it is unacceptable, and differentiate between a regular wig and a wig made out of a woman's own hair, include Ateres Z'keinim (OC 75:3), Be'er Heiteiv (OC 75:8, quoting Ateres Z'keinim), and Magein Giborim (75:8).
CYLOR for a practical ruling.
Mishna Berura (סימן עה, ס' ג, ס'ק טו):
(free translation; text copied from here)
I heard that it is okay. Because once it is no longer attached to your head it is no longer considered your hair.