Five Star leather sizing help

[onstar]

Im thinking about ordering a Cossack from 5 star, does anyone know if I should size up or down?

Also, does anyone understand what this means -the circled part?
Do they the jackets is 4-6 inches smaller than my normal chest size? And that I should size 4-6 inches for a more accurate fit?

 

[Zoro]

That's the measurement of the jacket itself. If you have a 44 chest, the jacket has to be able to contain it. If the jacket also measured 44, it would not be able to fit you and whatever else you wear (tshirt, sweater), thus why they recommend to choose a size 4-6 inches bigger than your chest.

I don't know if you should size up but you're the one that's been asking for the Aero Aeromarine, right? After reading a lot of 5 Star in their dedicated thread (which has hundreds of pages), I don't think I'll ever go with them. Specially if you're aiming to get a cheaper Aeromarine, the chances of being disappointed with what you get are just too high IMO.