I went for the look of Japanese boro mending, with all handstitching because I couldn't fit the sleeve under my machine and didn't want to take apart a lined sleeve to do that.
The cuffs were fraying as well. I put on black bias tape, handstitching it down to the inside to keep it looking tailored. It looks good with the black piping already in the blazer.
I love how the patches turned out! Subtle, yet distinctive. Even artsy. Even more important, dear Kim loves her mended jacket, too.