If I'm just out hiking/camping, then things don't change that much for me. I add my down pants (7oz), switch to an MB Alpine Light down parka (+12oz) and likely add a few more ounces in mitts/hat. The only big change is footwear which is a lot heavier. Most everything else (pack, shelter, pad, sleeping bag) is the same.
However, in the winter I'm usually out ski touring when I'm out, so that means extra gear like shovel, probe, beacon, skins etc and of course there's a lot more weight on my feet.