This is a blessing for the act of chest binding, for FTM transgender/transsexual and/or genderfluid people, and anyone else who chooses to flatten the appearance of their chest.
It is intended to be used as a way to sanctify the often painful act of binding. It can be recited daily and modified to meet your particular gender and Jewish needs.
This blessing was created by Rabbi Elliot Kukla and Ari Lev Fornari and is published on Trans Torah – Trans Torah offers a wide collection trans and genderqueer Jewish resources including rituals, sermons and essays.
See full blessing: http://www.transtorah.org/PDFs/Chest_Binding_Blessing.pdf