Well, the quilt was given to its recipient today and I got a picture of the proud new owner.
I was sent a box of shirts from his running career and pieced them into a 60" x 60" blanket. The shirts were all stabilized with fusible knit from Rowley's, and the back was a fleece chosen by the sister-in-law. The quilt has a layer of medium-loft batting to give it some extra warmth, and the whole thing is bound with a brown knit fabric, double-folded and machine-stitched to the front, then the corners were mitered and the back hand-stitched in place. The layers were secured with knotted embroidery floss at the intersection of each block.
The mitered corners were actually interesting to figure out; I'm going to do a tutorial on how to mark and sew them because, really, once I wrapped my head around the topology of the folds, it was quite easy and quick to do.