Game designers aren't armour manufacturers.
Just saying.
I think it's as big a difference as there is between the concept and the concrete thing.
Furthermore, personally, I never looked at any of the FO/FO2 ingame and inventory pictures as somehing more than a concept drawing: FO/FO2 tend to leave a whole lot to the imagination. Applying a ruler or another measuring device is close to absurdity.
Just saying.
I think it's as big a difference as there is between the concept and the concrete thing.
Furthermore, personally, I never looked at any of the FO/FO2 ingame and inventory pictures as somehing more than a concept drawing: FO/FO2 tend to leave a whole lot to the imagination. Applying a ruler or another measuring device is close to absurdity.