First I must say I was very anxious about doing this and should probably have done it with uglier fabric, but the deed is done.
Not impressed.
My straight line is crooked and wavy so now I have to cut more off to make it lay straight. It curles in about 1/2" so that's about 3" I just wasted. I didn't prewash. The selvedge lines up with the other side but not the side I ripped.
Now that this has totally left me shaking my head, I'm going for even more controversial techniques. I'm going to cut my 2-7/8" in strip before ironing, just hand-pressing the wrinkles away. I'm then going to starch the strip with Niagara that I just bought. I'm not going to pre-wash. Just going to cut and sew and press as I go.
I'll let you know how it goes.