Double breasted or center fastening?

[Giannis K. Hoplite]

Looking at the pteruges can give an idea. If there are two rows on the front and only one at the rear then it is double-breasted. How many illustrations show pteruges like this?

Of all those t&y tebictions,in how many can we see both the front and the back?
Not to mention that it i seasy to add a second layer of pteryges in all the back part.
And also,the Vergina iron cuirass that presumably copies closely similar cuirasses of organic matterials,is double fronted!!!
Khaire
Giannis