You can wear the vest with ANYTHING! flannel under will look the best, long sleeve t would work too...a thermal shirt, even a short sleeved t would look good if you wear it right...its a pretty versatile piece
I have a NF vest similar to this. I only wear hoodies underneath.
thats what i was thinking. hoodie under the vest seems like the best option. or a cool sweater. wish i lived where some of yall do that u can wear a l/s shirt and not freeze this time of year