When looking at Roman written works, it's important to remember that Roman garments and other items evolved over time, but the names of the items don't evolve at the same rate - so the words can change meaning over time. The people living at the time knew what was intended, but as historians we need to be careful to craft our interpretations carefully, using dates and context. Words, and the garments they represent, also took on symbolic meanings and were used in literature as symbols long after the garments themselves ceased to be worn.
For example: The "Vestis Longa" (long gown) worn by married women in the 5th century BCE becomes known as the "Stola" by the 2nd century BCE. By the early 2nd century CE the stola had become a symbol of traditional Roman matronly values, rather than a garment actually worn by most women. By the 3rd century CE few women had ever actually worn a real stola, but some women were still depicted wearing one in artwork because it was "traditional" to do so. The term "stolata" (literally, stola-wearing) was used in literature and on many grave stele as a traditional term implying that this woman was a "good wife" even though she probably never owned or wore a stola.
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Something to remember when looking at the extant Roman literature:
Many of the most frequently quoted authors were writing in the 1st century CE, but may be quoted by authors writing a century or more later. It is unlikely that the styles worn in the 1st century were the same as those worn 400 years later, even if the terms used to itemize them were the same.
Rank in Roman society was understood to include the right to wear certain articles of clothing, even if those items were not commonly worn at the time. Certain articles of clothing, therefore, became symbols of rank, office, and/or legal status. Consequently those clothing terms became literary symbols in the Latin language for that rank, office, and/or legal status:
Male authors routinely described what they *thought* an honorable Roman matrona (married lady) should like like, rather than what they *actually* looked like at the time of writing. Roman literature almost universally describes matronae as wearing the stola, palla, and vitta but this combination of garment is rarely depicted in Roman art. The stola and palla worn together - yes. The vitta is rarely depicted.
The palla is always described as being properly worn over the head (as a veil) and wrapped around the body to shield the matrona from the view of strange men, as demonstrated in the famous "pudesta" (modesty) pose seen in art of the early Republican period.
The earliest depiction of a stola (as an over-garment worn over a tunica) dates from the early 1st century BCE. Stolae are rarely depicted at all after about 175 CE, at which time the depictions are primarily formal and/or ceremonial.