I’ve not seen anyone wearing MTB dungarees in real life. I’ve mostly given up on trail centers so don’t see huge numbers of people hopping about getting kitted up.
Either that means you are going to be the absolute trend setter and can wear them however you like
Or
People have jackets on over the top.
I think I’d have a jacket on top so when the water and mud hits it, it runs over the jacket, then the trousers instead of jacket under dungarees so the water and mud runs over the jacket and into the crotch.
I’m a total sugar cube ( dissolve in water). I’d love to hear real world review of how they actually work. I wear braces to stop jacket/ trousers gaps when it’s minging. Integrated braces sound good.