No need for a thick winter jacket here. The suit underneath should give him enough warmth, so a thin jacket will just add a different texture to the outfit. He could have gone for another colour if...

Tommy Ton for GQ  

  I like how you first notice the brown buttons on this grey suit, and then your eyes focus on the red stitching matched with red cufflinks and pocket hankerchief. A good piece of detailing on this...