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My coconut one is a M and fits perfectly, I’m a 39/40 chest and sometimes wear a small in something if the arms are long enough, I emailed them and they said I was a M from the measurements i gave.
I’m not 100% sure they (Coconut Residence) are made by Jamiesons but looking at the design it’s quite possible, the yarn is likely from JC Rennie from what they say on the website.
either way they are nice sweaters, i’m thinking of buying another one.
Jamieson's sweaters fit ridiculously small. Ive got a couple. The first one I had to pass on to my wife as it is too small, it was a size 40". The next one I bought is a 42" L and even that is not anywhere like a large.
for reference, I usually wear a 38 or a 48 euro sizing, and for most jumpers I would take an M unless it was oversized and might size down. So IMO you definitely need to size up 1 size, more likely even two, for the jamiesons sweaters, and if you want a looser fit then another again, as silly as that sounds.
they are really amazing though.