My legs generally don't get cold when I'm skiing (as opposed to my torso, which gets somewhat cold, and my fingers and toes, which are absolutely freezing). As a result, I usually just ski with thin baselayer pants, and very thin ski (shell) pants that have no insulation. On a cold day (say below 20F) I'll wear a pair of double-layer thermal long underwear (duofold, I think) that I have and things are fine.
However, I'm going to be in Niseko in a few weeks, and the temperatures (looks like we're talking about lows of about -20 with the windchill up top, and around 0 at the bottom - guessing the average temperature without the windchill will be single digits - all temperatures Fahrenheit) are scaring me a bit. Obviously since I'm traveling to Japan, I want to stay on the slopes as much as possible.
So I'm wondering what I should do for my legs - common knowledge suggests (at least) 3 layers on your torso, but I can't find much, if anything, about midlayers for your legs. Does "midlayer" typically just refer to tops?
I don't really want to buy a pair of insulated ski pants because I may never wear them again, they'll be really bulky to pack, and who knows, I may be too hot in them. So is there something you'd recommend to wear in between the long underwear and shell pants?
Furthermore, how would they even work? These would be somewhat bulky (at least not skin-tight like a baselayer) so you wouldn't want to tuck them in your boots. Also it seems like having them all bunched up right above your boots would be awful. But then that would meet I'd need pants with a 24-inch inseam or something! Am I just confused?
Thanks in advance...