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I am not a fabrics expert or anything, but for reasonable efforts I found merino mix or merino jerseys way too heavy, too hot in mild weather and hard to layer on top of as they don't breathe as well as poly, and so got heated out or sweaty mess into icy cool-down. Maybe that's why merino is the go-to for baselayers, because they trap heat but evaporate better than cotton. Poly is more breathable and evaporates better than merino. Albion jersey is really soft, lightly thick and so paired with the super breathable but somehow v warm gilet it's a very effective combo.
Ha this happened to me this morning! I took it off the drying rail and thought something was funky about it. It permanently honks, it has just been worn so many times. I did get a backup off ebay tho.
The best replacement for it (well it has been for me) is an Albion LS jersey and their insulated gilet. When it's below 4 add a ss baselayer, and jersey and gilet I think replicates the warmth and flexibility. A kinda pricey alternative but their library archive sale has most of this in your size atm (I only say this as you sold me a frame so I'm guessing we're they same size) and there is strava code knocking around that you can add to it I believe.