Many people recommend that you don't dry linen on the hot setting of the
drier cause it creates lotss of fluff and damages the fibers a little.
However, if you make sure to clean your lint trap before you dry your linen,
you can get a nice ball o linen lint wadding. I managed to get enough
stuffing for a coif, during prewashing and drying linen for two tunics.
There are also places once can buy linen tow, which is a period stuffing.
My next gambeson will be 100% linen fabric from Fabrics-Store.com, I may
shred linen scraps and use that as padding. Otherwise I'll use a 100% wool
batting. I plan on prewashing the linen, hot, and hot drying. I'm probably
going to get my sister to teach me how to do set in sleeves properly
(something I've never mastered, but she has -- using the Medieval Tailor's
Assistant and a trig calculator) so I can do a more period pattern styling.