As suggested on this forum, I bought some and am giving it a try...
http://www.dharmatrading.comThere offer several weights, 5, 8, 11, and heavier. I bought some 5 and 8 and also a small sample of 11.
The 5 is the only way to go for wing covering. The 8 might do for front end or dihedral reinforcement. You could use the 11 for a tent. Somebody explained units of measure, but I forgot the story, just get #5.
I also bought a little jar of bright blue dye.
I cut off enough to cover a plane and proceeded to wash off the sizing. In the absence of instructions, I put the silk in a pail of hot water over night, then rinsed it in the morning.
The dying was simple. Step One is wait until the wife is safely out of the house.
Boil some water in a tea kettle. Put the boiling water and a few ounces of vinager in the pail, then sprinkle in some dye crysals, and stir.
Then put in the silk and stir some more. I added more boiling water, then dumped out the dye water and rinsed with tap water several times.
I hung it out to dry on some chairs, and to my surprize, the dye was perfectly uniform, first time ever!!!