VBL goes as near to the skin as you can tolerate.
The skin actually sweats a lot less in a VBL.
This is because the skin can sense how humid the air is around it, and it will regulate that humidity by sweating. It will sweat until that humidity is reached.
In the cold dry air this means a lot of sweating and a lot of wasted moisture.
The VBL handily prevents both issues.
Sorry Susanne but my experiences have shown different.
4 examples spring to mind.
1/ While in hot humid climates my body constantly sweats, granted i'm a pale skinned foreigner so it might be expected, but the locals also sweat, this in conditions around 100% humidity.
The body still continues to sweat.
2/ I recently got caught out the first day on a 5 day trip, my boots wetted out so had all the breathability of a plastic bag.
My feet continued to sweat constantly for the remaining 4 days.
3/ I do a fair bit of free diving in the summer months, after anything more than 1 hour out i start to get very dehydrated.
This swimming without a wet suit, even though it's submerged my body still continues to sweat
4/ A couple of times i misjudged the ocean temps and layered up too much under a dry suit, another time i should really have worn a wet suit as the sea was very warm, but it was out for repairs.
All these times i constantly sweated to the point of suffering from dehydration.
So in my experiences the skin does not control sweat depending on humidity levels, if the body is hot it will continue to sweat until you dehydrate in my experience.
I'd say - try it just with your boots first on a day out and about in some proper cold.
Young lady, i didn't move to Greece to experience proper cold
I do get roped into the old colder trip, but it's rare now days, i've just got no interest in wild camping if it's below freezing at my age.
As i say though i do enjoy reading and watching trip reports though, as long as it's from my warm house