At the end of the previous mishnah we discussed where a person may place the food he rescues during a fire on Shabbos: only in a courtyard that has an eiruv, or even in a courtyard that has no eiruv. Our mishnah comes to teach that whatever that place may be - and according to every opinion in the question of where one may rescue to - a person may take out all the utensils he needs to use.
The scope of the rescue - utensils, garments and wrapping:
Besides utensils, a person may put on any garment he will need to wear that Shabbos, and may wrap himself in a scarf or a tallis and in anything he needs to wrap himself in on Shabbos. All of these, which are needed for that Shabbos, may be taken out to that same place: according to the Gemara, to a courtyard that has an eiruv, and even to a courtyard that has no eiruv.
The opinion of Rabbi Yosi:
"Amar Rabbi Yosi" - Rabbi Yosi disagrees with the ruling that one may take out everything he is able to wear, and sets a limit: "shemoneh asar begadim" - the eighteen garments a person normally wears on Shabbos are the amount he may put on each time. One may not put on three coats one over the other, but only the usual amount. However, he may go back and do so several times: unlike food, a person may put on the usual amount of clothing, and then go back and do so again and again, provided that each time he does not wear more than the usual amount.
Telling others - "Come and rescue along with me":
The mishnah teaches that a person may tell others to rescue together with him. On the face of it this resembles the previous mishnah, where we said that what is rescued is ownerless in any case, since the one rescuing is limited in the amount he is able to take out. Here, though, we must distinguish between two explanations:
According to Rabbi Akiva Eiger: here, unlike with food, the owner of the items has the ability to keep taking them out again and again - whether according to the Gemara's comment, by putting on many layers of clothing, or according to Rabbi Yosi, by making repeated trips. Since he has this means available to him, the items are not ownerless. For this reason he does not use the wording of the previous mishnah, "Go take out for yourself," but rather a wording of assistance: to help him rescue his items together with him, and he is not giving them to others as a gift.
According to others: here too the items are ownerless, and the change in wording stems from a different reason: in the case of the food in the previous mishnah not everyone is equal in the amount he is able to take out - some can take out more, depending on where they eat and on whether they have already eaten their meal, all according to the various opinions, and for that reason the wording there was "take out for yourself." Here, by contrast, everyone is more or less equal in what he is able to take out.
In summary: in this mishnah we learned that to that same place to which one rescues, one may take out all utensils for use, put on any garment needed for that Shabbos and wrap himself in whatever he needs for wrapping; that Rabbi Yosi limits it to wearing eighteen garments each time, but permits going back and putting them on again and again; and also that a person may tell others to rescue along with him, and the explanations differ as to whether this statement renders the items ownerless or is merely a request for assistance.