Part of self-care is making sure you know why you do the things you do and making decisions for yourself and your body. You get to decide what you want to do or not do, and that includes you choice in (or lack of) underwear.
You probably have someone in your family that would freak out if you wanted to cut your long hair, or someone who told you what to do with the hair that you cleaned out of your comb or brush. You have probably seen people insist on covering their hair when leaving their homes, either for modesty or protection. Your mother probably told you not to let just anybody "play" in your hair. Why all the fuss? Why does it matter?