I think the cut works best when you can wear it relatively slim, though it’s quite versatile in the range of outfits it can go into. The aesthetic can go with more workwear-y stuff, luxe minimalist, musiciancore and I’m sure others. I think it would feel a bit aggressive in an actual CM wardrobe. Japanese sizing definitely applies – I’m usually a true-to-slim small, and the medium I have is fitted.
Anyway, it’s one of my favorite garments, and holds the honor of being something I wanted for years and had 0 feelings of letdown after finally getting it. From tracking the price of these over the past couple years on the used market, this is a great deal. So yeah go buy @Newcomer’s jacket.