Linothorax in roman army?

[TFLAVIUSAMBIORIX]

I was reading, a while back as a latin student, something about caracalla having troops who wore linothorax. Is this evidenced in the roman military in any form before this time? maybe among eastern auxiliaries?

VALETE

[Praefectusclassis]

Caracalla wanted to imitated Alexander the Great and is said to have equipped a legion as a Macedonian Phalanx (prolly in Dio and Herodian). It's therefore clearly a break with the past, if true.

[FAVENTIANVS]

Graham Sumner, in his book ROMAN MILITARY CLOTHING I made a reconstruction of it.