The best costuming sources are extant
garments and some of them you can see over here. Important to know is,
that there is no statistically significant quantity to generalize
"this type was made by that manner". It only can be declared: given
dress was constructed by concrete method.
Second suggestion is about condition
of preserved clothing. There is big difference between dress
thrown out as inreparable and king's robe, which was part of state
treasure. Also we should be careful in case of burial robes. Today we
also don't bury in T-shirt and jeans but in suits.
Specific topic are swamp finds, because there is question if it was
robbery homicide or execution of "witch".