This half-zip, long sleeve, merino wool top had a hole at the left shoulder.
Located scraps saved after a prior refashion of a large merino knit polo into smaller t-shirt. The fabric is lightweight and relatively thin, but very durable.
Cut out and pinned a double-layer of the scrap merino on the outside of the top.
Sewed several times around the scrap edge with a wide zigzag stitch.
