There really isn't much that mentions what the free women of the Wagon Peoples wear. Here is what I gleaned from Book 4.
Tuchuk women, unveiled, in their long leather dresses, long hair bound in braids, tended cooking pots hung on tem-wood tripods over dung fires. These women were unscarred, but like the bosk themselves, each wore a nose ring. That of the animals is heavy and of gold, that of the women also of gold but tiny and fine, not unlike the wedding rings of my old world.
Nomads of Gor    Book 4    Page 27
"Stand aside, you fool!" cried a girl's voice, and to my astonishment, astride the saddle of the monster I espied a girl, young, astonishingly beautiful, vital, angry, pulling at the control straps of the animal.
She was not as the other women of the Wagon Peoples I had seen, the dour, thin women with braided hair, bending over the cooking pots.
She wore a brief leather skirt, slit on the right side to allow her the saddle of the kaiila; her leather blouse was sleeveless; attached to her shoulders was a crimson cape; and her wild black hair was bound back by a band of scarlet cloth. Like the other women of the Wagons she wore no veil and, like them, fixed in her nose was the tiny, fine ring that proclaimed her people.
Her skin was a light brown and her eyes a charged, sparkling black.
Nomads of Gor    Book 4    Page 32
The Wagon Peoples sometimes are also willing to barter silks to the Turians, but commonly they keep these for their own slave girls, who wear them in the secrecy of the wagons; free women, incidentally, among the Wagon Peoples are not permitted to wear silk; it is claimed by those of the Wagons, delightfully I think, that any woman who loves the feel of silk on her body is, in the secrecy of her heart and blood, a slave girl, whether or not some master has yet forced her to don the collar.
Nomads of Gor    Book 4    Pages 57 - 58
The Wintering was not unpleasant, although, even so far north, the days and nights were often quite chilly; the Wagon Peoples and their slaves as well, wore boskhide and furs during this time; both male and female, slave or free, wore furred boots and trousers, coats and the flopping, ear-flapped caps that tied under the chin; in this time there was often no way to mark the distinction between the free woman and the slave girl, save that the hair of the latter must needs be unbound; in some cases, of course, the Turian collar was visible, if worn on the outside of the coat, usually under the furred collar; the men, too, free and slave, were dressed similarly, save that the Kajiri, or he-slaves, wore shackles, usually with a run of about a foot of chain.
Nomads of Gor    Book 4    Page 59
I supposed that Kamchak would have one of the tiny nose rings affixed; all Tuchuk females, slave or free, wear such rings; after these things there would only remains of course, an engraved Turian collar and the clothing of Elizabeth Cardwell Kajir.
. . .
He did not permit her, of course, to bind or dress her hair; it must be worn loose; that alone, naturally, was sufficient to mark her slave among the wagons.
Nomads of Gor    Book 4    Pages 62 & 64