Frankly speaking, it's a chest binder, and I use it to do exactly that; bind my chest. I may or may not be trans, I may or may not just have really low sensitivity to gender as a whole since I think all of this gender roles fuckery is absolute bullshit, I may or may not have dysmorphia of my chest (it's possible since I already have dysmorphia of my face). Whatever I may or may not be, that's eventually up to me to decipher.
The only sure thing I know is that when I wear it, I feel better about myself. And that's the only thing that matters for this.
I will say that I sympathize with (is dystrophia like dysphoria?) your issues and that you are the one in charge of what you do with your body and it’s no one else’s business.
Thank you, Dom. Dysmorphia is similar to dysphoria, but has nothing to do with feeling like the wrong gender/sex. For me, my dysmorphia makes me pick out every flaw until I no longer look human in my own eyes. I sometimes find myself just staring at my reflection, nitpicking every detail; my nose is too big, my lips too chapped, my eyes too small, my cheeks too chubby, my eyebrows too out of place, my teeth too yellow or white, my launch lines too odd, etc.
It is entirely possible that this feeling could be translated to the rest of my body, including my chest feeling too big or too small, or not shaped right.
I only ever learned I had it recently, since it's been written off as body issues or self-esteem issues, like it's a feeling I can cure by loving myself more. Unfortunately, it's not.