Stitches, you've got your suit / coat and tie game down. Seriously, excellent every time these days. However, since you've cross-posted I hope you don't mind if I make some observations on how you might get your casual game to the standard of your other fits. The coat is very nice in itself but in this combination, it somehow come across as a little old-manish (and I don't mean 'mature' here). I think it's the combination of a casual coat worn directly on top of pressed trousers, in addition to beige on top of brown, but for whatever reason, the coat and the trousers / shoes don't go well together. The purple scarf and shirt are also at odds with the rest and look like you've tried to colour match very hard with each other but not with anything else. The scarf also doesn't seem to be doing anything; it's just 'there'. Compare Spoo's scarf fit just a few after yours. Okay, I know Spoo's is an exceptional scarf, but it also 'does something' there because of the way it's worn and the careful attention to colour and pattern. Finally, people in SW&D have mentioned your thing for 'pointy' shoes, but this would definitely be a fit for rounder shoes and more casual trousers IMHO.
In general, I don't think that casual clothing even in CM is just a matter of not wearing a tie or throwing on a casual coat over pants and shoes that you'd normally wear with a coat and tie. I think there's a whole different set of considerations around reduced formality in terms of cuts, texture, shape (in the case of shoes or boots), pressing and so on. I think that this is where a lot of CM casual fits go wrong (and a lof of them do - it's one of the reasons, I don't really look at the CM Casual thread any more).
Thinking along these lines, it's not that the coat could not ever worn in less casual combinations. In fact, I think you could absolutely wear this coat over a suit and it would work. There's something about the in-between, the no-man's land that you're in here that can make everything stand out as problematic in some way. Do you know what I mean?