linothorax and other white cuirases

[Alexand96]

The point Is that Roman did find a flexible armour

Really? Where? All that I've seen is stone depictions (without any colour) of Romans striking the very famous "heroic pose" that originates in much older greek art. The ONLY non-metallic looking (see how subjective even that statement is?) muscled cuirass I've ever seen in years of amateur sleuthing is from the famous mosaic from Alexandria where, as far as the consensus in academia goes, some (Augustus? Alexander? Agrippa?) famous general from the Greco-roman world looks to be wearing green kit, cuirass included.

I dare you (in all honesty - no jest) to find any evidence for any flexible muscled cuirass worn in roman context. You'll be a star in all the Hollywood-educated world mate (ok, that is jest )