the shirt off (or on) one's back
informal Used to refer to someone’s last remaining possessions: he had fled to France with nothing but the shirt on his back...- He learned that if he took the shirt off your back and showed you the blood of children in the fabric, people would snap alert.
- A Scorpio will gladly give you the shirt off their back if you need it, but you may get the slightest inkling that they have an ulterior motive for doing so.
- And Afghans themselves are very generous hosts; they would give you the shirt off their back if they felt you needed it.
See parent entry: shirt