There are three distinguishing features of the stola that are usually mentioned in Roman Literature:
- It’s length – in literature it is described as always covering the feet, though this does not necessary seem to be the case in Roman art
- An element called the institia, which is never defined in the literature. For decades the institia was described by historians as a “flounce” sewn onto the bottom of the stola, even though there is no precedence for such a thing anywhere else in Roman fashion and not a single Roman-era image exists that depicts something with that appearance. The institia is now thought to be a band or colored border woven into or sewn onto the hem of the stola that would still be visible when covered by the palla, although not all stolas appear to have had a contrasting border. It is also theorized by another author that the institia were the straps that passed over the shoulders, connecting the front and back of the garment, even though not all stolas appear to have had straps.
- The stola is *always* worn over an undertunic with sleeves reaching to at least the elbow, unlike the Greek, Etruscan, and extremely early Roman versions which were worn alone. The extremely early Roman version was called the vestis longa, rather than the stola. The garment kept the name vestis longa even after it had evolved into an over-garment and gradually became known as the stola. This element of the stola does seem to be portrayed consistently in Roman art.