The Devonshire Hunting Tapestries are Flemish artworks from the mid-fifteen century. Some costumes of the participants in the hunting event look very similar to the outfit of the archer from the Voynich Manuscript.
There is no way to tell if the VMs artist meant the archer's headgear to be white or simply didn't care to color it.
White chaperon was used as political statement in the late 14th - early 15th century when it was adopted as symbol of the Flemish revolt of 1380. The white head cover was used as symbol also during political bickering in Paris, 1413. Albrecht Classen explains it in his book Urban Space in the Middle Ages and the Early Modern Age.
Even if the VMs author had in mind white chaperon - it doesn't necessary mean it was meant to be a political statement.
Another example of similar costume from Flemish tapestry c1450.
Chaperons with blue dress can be found also in the illustrations of French copy of Decameron -15th century (not earlier than 1414 when the text was translated), BnF Francais 239 ( visit here ).
15th century French manuscript about the life of Alexander the Great exhibits similar fashion - BnF Francais 9342.
VMs researchers found similar Voynichese dress from Germany and Northern Italy, so the archer (like everything VMs ) doesn't help to narrow down the search area. The outfit seems appropriate for 15th century North Western Europe.
15th century Württemberg, University of Tübingen, MD 2 visit here