I thought this was helpful - it's from the Curious Frau
Always period, if a little warm in hot climates. Keywords to look for
when purchasing online: broadcloth, tabby, worsted, flannel, tropical
Silk comes in many different weights and weaves, from light as down
to a heavy full bodied satin. Interlining silk with linen can give it
more body and help it hang better. Keywords to look for when
purchasing online: Satin, poplin, broadcloth, twill, shantung,
brocade, taffeta, faille, repp, habotai. Silk noile is controversial
as a period fabric, as is duponi in some circles.
While there are not many extant outer garments made from linen, there
are a few! Linen is undeniably documentable for underwear, linings in
garments, stockings and ladies headcoverings. Its a good fabric for
hot days since it keeps you cool.
Fabric to avoid
Anything knit, jersey fabrics, rayon or polyester. Striped fabric is
not documentable for the German lands, although fabric pieced into
stripes is, go figure.
There were no chemical or aniline dyes during the 16th century, but
they still wore plenty of color. Reds, pinks, yellows, oranges,
greens, blues, browns, blacks, greys are all represented in period
artwork. A good resource on what colors can be obtained with natural
dyes is the book Wild Color
Online Fabric Sources
Good selection of Linen in a wide variety of colors. Nice selection
of white linen in various weights and lots of rich colors in heavy
weights. Their linen is only slightly more expensive than Fabrics-
store, about a dollar a yard, but nicer quality. Be sure and also
check out their great Italian cotton velvets and nice silks.
Wonderful selection of linen at good prices, never had any trouble
with customer service and very prompt delivery.
Wide selection of linen, silk and wool in a wide variety in prices.
Be sure and get on their mailing list so you are notified of their $5
a yard sales.
Has occasional fantastic sales on merino wool and silk. Definitely
get on the email list so you find out about the sales