ESFJ who totally hated me (and vice versa) did the same. There's one catch tho.
I've seen S's been more content with the change of appearances and impressions than N's .. like, with the idea that image changes, person changes. It was calm time in our war, so perhaps she didn't hate me at the time (that silly girl).
She 99.9% sure wasn't flirting with me, but I (intuitively) sensed that it expressed a message at the same time. When the discussions went more intense and interesting and it got hot in the room, she wanted to take off her sweater and to reveal her top (which was always flattering to her shapes).
And for anyone of you out there, it didn't mean a damn. She just felt more comfortable looking good after having chatted for a while, and that's it.
edit: I only wrote about clothes, but she loved doing her hair too, and having her hair done (sorry I don't know the beauty parlance in english language) when amongst friends.
edit 2: she also loved doing costumes once in a while, and changing multiple theathrical wigs while in that mood.
edit 3: I'm the grand misdiagnosis-maker of this forum, having scored 3 incorrect letters in pt's typing game.
edit n: please slap me in the head really hard. Just do it.
edit n+1: I also misjudge whether someone is interested of me or not.