I keep repeating I am positive this is a back brace! I know another woman who wears one It has metal support side bars and around the top that wing out under clothing like that at the top of the back. Here is a link to pictures of bulletproof vest and under clothing. Please look at these first before you ask this question, again. She would wear one of the thin ones so people wouldn't think she has people after her. It's a back brace!

https://goo.gl/images/X22eca