Lynn, I thought perhaps it would be good to start a new thread talking about fibers for socks. (For those wondering our sock conversation started here in post 13.)
I recall reading that you can use elastic thread along with cotton to help it have some recovery from the stretching out of the cotton.
If hand made acrylic socks wear out fast perhaps it would be better to go with store bought socks. I'm sure he wouldn't mind if you wanted to knit him yummy cardigans or vest etc instead.