Put the mittens on over your gloves so you gloves don't get cold.
Mittens on a long cord inside your coat and down your sleeves.
Can't drop a mitten in the snow if you have to take one off to reload and shoot your rifle.
A sidenote on the matter. Bicycled to work the other day in some -7 celsius. I wore my Mechanix gloves and on top a pair of shell mittens. Lo and behold; suddenly I meet a girl on bike with bare hands! How on earth could he stand the cold?! She had pulled the jacket sleeves as low as possible but still there was bare finger. My hands would have hurt as h**** without gloves.
She may have been accelerating a biochemical change in her hands. The same thing which happens in bird legs and toes.
Using cold as the stimulus, the lipid molecules in bare/skinny extremities are gradually replaced with others to maintain flexibility.
The reverse takes place as the weather warms up in spring. Probably easier to demonstrate in an ugly cold place like where I live.
Fuzzy gloves with a leather cover and mittens if I have to.
I've watched guys in the logging business work bare-handed at -20C (changing wheel bearings.)
I've watched piano students get ready for a recital = the BIGGEST and fluffiest mittens I have ever seen.
My mitts have a loop cord which you can tighten around your wrist. It keeps the mitt very close to your hand and I can (with difficulty that means I'd never do it unless I had to) put the mitt on with just my teeth and the hand that's going in it.
Used to have mitts or gloves on the cord Through the coat as a very young kid. Hated it because I could feel the cord over my shoulders. Plus it was knitting wool. Our boy had a plastic cord but he too kept taking it out when he could. As soon as he gets one mitt off the clip he would lose the other mitt running around so we'd have to retrace our steps to find it.
Some jackets aimed at cold weather have D loops on the sleeve to clip outer mitts to for security. Of course my extra security is to have at least a second glove / mitt system in my pack that's able to cope with the conditions. You really don't want to lose a mitt or glove to have nothing to replace it with.
I wonder how they diagnose reynauds? My go just said it sounds like it and printed a sheet about it like it was true. I don't get the symptoms now so I doubt it's a real m diagnosis for me. I wonder if there's people living with it who might have another condition that's treatable?