I made a throw from recycled corduroy slacks. As Cash's Mom reminded us, corduroy has a nap so you may want to keep that in mind when laying this out. I just checked and I used 1/4" seams. It has not been a problem. Since this was recycled corduroy, perhaps it became more sturdy with the repeated laundry but I've had no problem with it fraying, etc. Yes, I believe I would launder that, if nothing else than to get rid of some of the linting if any,
I machine quilted in the ditch so the nap would stay fluffed and then tied in the center of the block. I remember tying that one with black thread--took it out as it looked like giant spiders!
This throw has a batt and flannel backing. Wonderful when my feet get cold in bed on a winter's night!