Under Armour Coldgear tops (& leggings).
Very soft, comfortable, and warm.
You can get them in compression or fitted, depending on your preference.
I use them as my base layer (top and bottom) and love them. Switched from regular wool and polyester base layers.
+1 for Under Armour
All I ever need to wear on a normal day is my under armour cold gear mock and a t-shirt and I'm good.Also really versatile, I've used it to play football, run, and just as a normal day layering piece.