According to the picture, she wears some kind of armor made of bones. It's not listed under her possessions, but her ac breakdown includes "+6 armor". I'm guessing it works like chainmail and just looks weird?
Jeslyn's armor comes from one of her oracle revelations.
Armor of Bones (Su): You can conjure armor made of bones that grants you a +4 armor bonus. At 7th level, and every four levels thereafter, this bonus increases by +2. At 13th level, this armor grants you DR 5/bludgeoning. You can use this armor for 1 hour per day per oracle level. This duration does not need to be consecutive, but it must be spent in 1-hour increments.
As Jeslyn is a 7th-level oracle, she gets a +6 bonus from this revelation and can use it for 7 hours per day.