Please consider moving the headtorch to the glasses slot, or make either possible, so it can be worn together with hats and helmets (apart from moto helmets obviously). In cold temperatures you really do not want to swap your ushanka for a headtorch - and knowing I could wear them together in real life makes this very frustrating! Add to that that the NVG - which is obviously an even better item to use at night - can be worn together with hats and helmets, and it is doubly frustrating...
There is a mod that does this "HeadTorch_fix" - but I see no reason this should not be a vanilla feature. Plus the mod, being a mod, is not perfect. Sometimes the light source will show about one meter above the player's head, plus using L to switch it on and off doesn't work so you need to take it to hands.
Alternately make the lamp and headstrap separate items - just like the NVG - and make it possible to attach the headtorch to the tactical helmet and hard hats for example.