I got this shirt from Redbubble - so it was made to order back some time ago, and I think I've only worn it 4 times or so.
K.K. Slider is my favorite from Animal Crossing - lots of fans will smile seeing you wear it, and you can even have a nice nostalgia conversation!
It shrunk a bit- so I am between L and XL, so this will no longer work for me. I honestly think if you are size M, you'll be fine with this.
LOVE the sweater, as it is very soft, but just won't fit my fat self anymore - Hope you can give it a new, loving home!