The tunic with long sleeves (tunica manicata) was a later fashion.
Both the alb and its name are derived ultimately from the tunica alba, the white tunic, which formed part of the ordinary dress of Roman citizens under the Empire.
cap. i I), an under tunic (linea), an upper tunic (dalmatica, tunica) and mantle (lacerna, byrrus).
The tunica, a loose sack-like tunic with a hole for the head, was the innermost garment worn by all classes of Roman citizens under the republic and empire.
It was either sleeveless (colobium) or sleeved (tunica manicata or manuleata), and originally fell about to the knee, but later on reached to the ankles (tunica talaris).