# a screen

This was a large curtain made of cloth.

# blue, purple, and scarlet material

"yarn that is dyed blue, purple, and scarlet," probably wool yarn, or "blue, purple, and scarlet dye" to dye the linen. 

# fine twined linen

"finely twisted linen." This was cloth made from fine linen threads that someone twisted together to make a stronger thread.

# an embroiderer

"a person who sews designs into cloth" or "a person who embroiders"