I've seen a decent chunk of representative artwork that suggests bingo-wings on the forearms are used specifically with forearm armor intentionally worn as the inner layer so the maille is intended to be draped
over the rigid protection. Same with upper arm bingo-wings. When the rerebrace connects to the doublet, and the maille is bloused over the rerebrace the maille needs bingo-wings to drape properly. But if maille is the inner-most defense, then it obviously needs to be fitted.
So bingo-wings are historical,
IF the maille is being draped
over another piece of armor. I'm sure there are counter-examples, but that's a good rule of thumb.