Shabbos, Chapter 6, Mishnah 5. The Mishnah continues to list the items a woman may wear when going out into the public domain on Shabbos, those that are forbidden to her, and the reasons underlying the permission and the prohibition.
"Yotz'ah ishah b'chutei se'ar":
A woman may go out into the public domain on Shabbos with the hair threads with which she ties up her hair, and it makes no difference where the hair comes from:
"Bein mishelah" - her own hair, which she cut and is now using.
"Bein mishel chavertah" - the hair of another woman.
"Bein mishel behemah" - even the hair of an animal is permitted.
In an earlier Mishnah in this chapter we learned that a woman may not go out with woolen threads or linen threads, because when she comes to immerse in a mikvah she will have to untie them so that the water can reach her hair, and as a result she may come to carry them. Hair upon hair, however, is not a chatzitzah, and it does not block the water from reaching there. She may therefore leave the tie firmly in place, and since she has no need to untie it, there is no concern that she will remove the threads and come to carry them on Shabbos.
"U'v'totefes u'v'sanbutin bizman shehen tefurin":
The totefes is a band that a woman wears across her forehead from ear to ear, and the sanbutin are a sort of straps extending from it, whether they are made of gold and silver or of colored cloth. The permission to go out with them applies specifically when they are sewn into her head covering, for then there is no concern that she will remove the head covering and carry it.
This condition applies to both of them together. For in Mishnah 1 of this chapter we learned that a woman may go out neither with a totefes nor with sanbutin - and there the case is where they are not sewn to the head covering. Here, by contrast, the case is where they are sewn to it, and therefore there is no room for the concern.
"B'kavul u'v'peah nochris l'chatzer":
The kavul is the item beneath the totefes - the piece of cloth that protected her forehead from the metal band she wore. The peah nochris is a wig made from the hair of another woman. With these two she may go out into a courtyard only, and not into the public domain.
Padding and cloth used for absorption:
The Mishnah goes on to permit going out with these items as well, and there is no concern that she will remove them:
A piece of cloth or fibers, something like a ball of padding, placed in her ear to absorb fluids coming out of it.
A piece of cloth she placed inside her sandal, so that it should not rub against her foot at the site of a wound or the like.
The padding that a woman uses during her days of niddah. Nowadays disposable pads are available, but in those days there were none, and this is what they were accustomed to use.
Pepper and a grain of salt:
She may go out with pepper, with a grain of salt, and with anything she is accustomed to place in her mouth, provided that she does not place it there on Shabbos. If it was in her mouth from before Shabbos it is permitted, but it may not be put in on Shabbos itself, because all of these items placed in the mouth, from pepper onward, serve as a remedy, and one does not place anything medicinal into the mouth on Shabbos. In any event, if it was already there, it may remain. And if it fell out on Shabbos, it may not be put back, since returning it is like placing it there in the first place.
A false tooth and a gold tooth:
There is a dispute about this: Rebbi says that she may go out with it into the public domain, and the Sages forbid it. The reasoning of the Sages is that since the tooth is different from her other teeth, we are concerned that others may mock her, and as a result she will remove it and come to carry it out.
In summary: In this Mishnah we learned that a woman may go out with hair threads - her own, another woman's, or an animal's - since hair upon hair does not interpose and there is no concern that she will untie them and carry them, unlike woolen and linen threads. She may likewise go out with a totefes and sanbutin when they are sewn to her head covering, and with a kavul and a wig - into a courtyard only. We also learned the permission for padding in her ear, in her sandal, and prepared for her niddah, the law of pepper and a grain of salt, which may not be placed in the mouth on Shabbos because they are medicinal, and the dispute between Rebbi and the Sages regarding a false tooth and a gold tooth.