Just playing devil's advocate here but maybe their gloves were off because they eventually started getting frostbite on their fingers, even with gloves on, and in that case you want to check what is going on with your fingers, why they went numb, maybe try to warm them up with the air you exhale.
This doesn't explain unbuttoned jackets.
Jackets are problematic. Removing gloves when your fingers are numb is clever. The glove if with fingers does not allow to warm your fingers in a fist or in your inner clothes next to the body. The problem is that only Zolo or Nikolai were having them. Meaning others left tent not taking any. Here I can't think of a reason if not made to do so. For shoes and outer jackets it is easy - those are wet and frozen for leather shoes and jackets were laid for flooring , and also could be wet. In cold you avoid wet clothes as plague. But wet gloves is something I would take. It is easy to dry on fire, easy to use two layers knitted as first , wetted leather or polyester ones on top. Also have noticed that if wet but woolen a glove still warms if you move and tends to dry . Only not moving / walking had been a problem with a wet glove, that is predominantly wet inside from your hands, quite unusual to wet them from outside if the snow is not melting and you don't bild a snowman with it.
Opposing the general opinion of undressing I find their clothes exactly the right amount and layering if something happens at night and you need to go out not having time to defrost /dry shoes and outer jackets. Only Dyatlov is very lightly dressed with just vest on top of shirt. All others have layered what would be dry and useful after day of skiing in snow. But why leave the gloves when they can't become unusable .....
To play a bit too, I tend to unzip my jacket if I walk (uphill), even modern ones that "breath" start suffocating and sweating you when you put effort and they have put a lot. Maybe not fully unzipped, but from the neck to middle chest. This is not specified. Tibo and Zolo are the ones with jackets, in the pictures of them taken out of the ravine they looked unzipped from the neck, but for sure not fully open.. So... What happened between them being found and the morgue. Same for the gloves, don't remember them among inventory of the tent. What if they have been taken before the autopsies seen as useless things for the dead ... So many options, endless😵😵😵