Copyright AriaAustin, 1999 - 2010, all rights reserved.
A popular term for wearers of inauthentic renaissance faires is "farbie".  "Farb" is taken to stand for "Fast And Researchless Buyer".  This is sometimes the case, but not always.  Sometimes, often, I believe, the wearer simply had a dream gown in mind that was inspired by authentic renaissance gowns, and wanted a gown known to be inauthentic.  Certain associations have strict rules for authenticity, but not all.  The NorCal Renaissance Faire, which I attend, frequently has people dressed as fairies.  So why not have some gowns actually inspired by the real thing, but aren't?  If you can dream it, I will create it.
Inauthentic Renaissance Gowns