Its something to compress ones breasts to make them appear smaller/non-existent. It is generally used by AFAB people who have top dysphoria. I hope this is accurate since I do not use it myself. A google search should also help
Aha...
I tried telling my mum I'm non-binary with ties...
I actually miss that about high school.
The uniform.
Cause I enjoyed wearing the shirt and tie.
*sighs* As soon as I graduated. Couldn't Couldn't wear a shirt and tie...
So I'm just stuck with having both the Slytherin and Ravenclaw house ties and no shirt to wear it...
*My Parents*; My child comes out as non binary; I tell her that she's a girl; I wont use they/them, and wont get her a chest binder; Why does my child hate me?