>>1975421I make a ranger taco out of a tarp and a wool blanket sometimes, rather than using a sleeping bag and tent. It's not for super cold weather or foul weather, but it gets the job done.
For nasty cold weather, I have a heavy canvas pup tent I rain-proofed with silicone and Greenland wax, a US mil-surp self-inflating sleeping pad, and a Czech army bedroll, the one that comes with a linen sheet and a blanket-style button-in liner. Very comfy down to freezing. If it gets colder, I add one or two US mil-surp wool blankets, and for really shitty weather I add the goretex bivy cover from the US four-layer sleep system. Chemical hand warmers or a Zippo hand warmer inside the sleeping bag go a long way, as does wearing proper clothing to bed. You can also buy a little lantern that holds a tea candle to add a little extra heat inside the tent; the lantern holds the candle so it doesn't start a fire or spill wax everywhere.
Remember not to have too much bedding/clothing when sleeping at night in the winter; if you get too warm and start to sweat in your sleeping bag, it's bad news.