Well I think it would be proportional to the chest. i.e. not the same size on a 38" as it would be on a 44". I'm not too sure exactly, might be best to have a look at one in person. Around 4 inches I would guess?
You can search the forum for discussion on the TF silhouette, but essentially it is a wide peaked lapel with a clean, shaped chest, roped shoulder, trim waist. It's an exaggerated masculine shape. Other details like 5 cuff buttons and large pocket flaps are signature.