Tina actually wore wigs for many years after a health condition made patches of her hair fall out. She's grown it back now, with a LOT of help from doctors and... non-doctors, so she's extra proud of it.
Ms. Shell was actually the one to help her style her old wigs, and in return, Tina taught her makeup skills and loaned her clothes.
That diadem is from... Well. It's not from anywhere local. Don't go wandering into the woods at night with it on, unless you're prepared for a long trip somewhere unexpected.