cold is about layers of clothes. you not want tight clothes because each layer hold air. and this keeps you warm
so you have many layers.
so have thermal underware. then tee shirt. then sweatshirt then coat.
this works out very well when work outside. because can actually get hot.
do not want sweat. so you take off a layer or two.
to regulate your temperature
then when quit work or take break you put back on layer
but never ever want take off hat
can get frost bite on your ears easy