I assume you are talking about the Black Fleece trench, which is pretty sick. I would pair it with mid-navy donegal or flannel trousers. Or maybe some British khaki-coloured trousers and a blue DB. Or how about a thick navy mock neck sweater and some grey flannels? Add some cordovan-coloured loafers or some brown monks to any of those looks and you’d be all set. There are clearly a lot of possible combos out there, but I would keep the accompanying items pretty basic with a coat like that.