What to wear underneath Causwell Reasons jacket

Hi,

I got a Causwell reasons jacket over the summer in Large (I'm about 5'8) so it's not that long and baggy anyway I used to wear a tee shirt underneath my old Salomon Reflex jacket but just a tee will be too cold for my jacket now, those of you who have it what do you wear underneath for 0-25 degrees? I don't really own a sweatshirt or hoodie or even a thermal so I will have to buy it whatever I get.

Thanks
 
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you might not think they are cool, but an icebraker (or any brand that uses merino wool) baselayer and then a hoodie as a midlayer will be the essentials in the cold.
 
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