Im into historical reenactment and and a member of a "knights brotherhood" (couldnt find a percise translation of the term "bractwo rycerskie").
We are trying to recreate the material culture of the past, in our particular case, XIV and XV centuries. We are trying to be as accurate as possible, basing our reconstructions on academic papers and articles, archeological findings etc. We encounter big problems tho.
Findings of complete set of clothes or armor, especially from day to day use are practically non-existant. Most of what we have are single items scatterd around whole europe, often partial, half rusted/rotted away. Iconography and statuses from those times can be misleading, often are symbolic, we dont know what is a true depiction and what is just the artists fantasy.
This makes making a complete reconstruction very hard. We often "borrow" elements of garments or equipments from slightly different places or times ti fill in the blank holes. We also have problems with the "popularity" of certain solutions. For example, we may see a soldier in hourglass gauntlets on an icon. Still, we have o problem - how popular was such equipment among soldiers? Did half of them have those, or just 1/100? I mean in general, not in a single unit. Sometimes documents from the past help us, for example bills from castles for equipment for their guards (sorry, im having problems translating such history-specific terms to english), but still the problem remains.
Question Id like to have some experts advice or scientific articles on how to judge whether borrowing a piece of material culture from another region would be acceptable and result in a trustworthy reconstruction (one that has versimilitude). Can I "borrow" a helmet used in England for a Polish soldier, or should I refrain to using only one of the two (this is only an example ofc) actually found in Poland? How to make a good judgement call on such a matter?