Why does Karana often dress her yucca dress and sandals? Pg 114-115

Karana wears her yucca skirt and sandal just to dress up....... simply to look pretty.

I also made a pair of sandals from sealskin for walking over the dunes when the sun was hot, or just to be dressed up when I wore my new skirt of yucca twine.
Often I would put on the skirt and the sandals and walk along the cliff with Rontu. Sometimes I made a wreath of flowers and fastened it in my hair. After the Aleuts had killed our men at Coral Cove, all the women of our tribe had singed their hair short as a sign of mourning. I had singed mine, too, with a faggot, but now it had grown long again and came to my waist. I parted it and let it fall down my back, except when I wore a wreath. Then I made braids and fastened them with long whalebone pins.