I have this shirt / coat, in a L size, my chest is currently measuring 48", the L fits me with an allowance for a lightweight shirt / top underneath, I would reckon the advertised one above would suit someone of the same chest measurement with a heavy jumper or the like under it. these are great bits of clothing, & at the advertised price, a bit of a steal in my view.
(The Unspeakable In Pursuit Of The Uneatable.) " If I can help, I will help!." Former S.A.C.S. member!