Was looking at that also and it got sniped. Ended up with 2-Armor Lux tanktop and Filson vest. Don't know anything about the former brand, but looked like a nice color combo and not much of a loss at $15.
I don't remember which Beaufort I have (I think the non-sylkoil), but I have had both liners and they zip into mine. I think they make the warm pile liner in two different versions, one with buttons and the other with a zipper. Not sure about the sylkoil one.