WOW! My guess was simply a "guess based on a bit of PEI history".

I am a M'Donald from PEI. My family is from St. Peter's Bay; just next to the "lots" wherein the John Alexander M'donalds resided. When this challenge was presented I was immediately drawn to it due to my family links to PEI. So, perhaps my Island links really helped me out.

I am, however, interested in knowing what this tartan really is. Is it a MacDonald or another unidentified piece? I'd love to know. I'd also love to have a kilt in this as well.