See [Can a Sheitel be made out of one's own hair?](https://judaism.stackexchange.com/q/38375/1145) where the question wonders whether a woman is allowed to wear her own detached hair as a Sheitel.

[In Fred's answer](https://judaism.stackexchange.com/a/38378/1145), he quotes the [Shiltei Giborim (Shabbos 29a in dapei haRif)](http://hebrewbooks.org/pdfpager.aspx?req=37953&st=&pgnum=607) who says it is fine.

However, upon looking in the Shiltei Giborim, you will see a very interesting thing. He twice mentions(, the second time clearer then the first) that a woman's hair is only Ossur if it is attached **AND** the attachment can be seen. 

He seems to be saying that if were one to wear a bandfall or headband on their actual attached hair where the head meets the hair, and the actual attachment itself is not visible, that would be OK too.

Unless I am wrong, not a mention of this Heter exists in any known seforim or Poskim.

Do you know of a Posek who allows use of this Heter? If not, why doesn't a single Posek mention this Heter? The Shiltei HaGibborim is the mother of the Leniency of the Sheitels, why isn't this important caveat well known and allowed?