Have you ever heard someone say, "He'd give you the shirt off his back,"?

Sure I would. It would probably look better if you did it, though.....

I've heard that expression lots of times. Sure.

Yes I have heard it

and

it depends on the person

I have traded the shirt of my back for another.

no, most people wouldn't want to see that but i would give my friends all the money in my wallet and i have given my best friends my debit/credit card if i was stuck at work

Give my T-shirt to someone? Why would i?

I've heard it several times. The funny thing is I've never seen it happen.

I've heard that. A ton of people say that to me and I don't know why.

I usually just take their shirts.

They benefit.

Yes under the right conditions. I would.

It means that they would do anything for you.

The expression comes - I believe - from the old days of Pawn Shops, where people would even pawn their clothes.

Hence - they would even pawn their clothes for you.

i have heard it ... but honestly i dont want some shirt that someone has worn all day. they can have it