I dont know much about fabrics so I really need some help. I

founds some floor pillows which are 95% feathers/5% duck down

enclosed in 210 thread count cotton twill fabric. Will the

feather quills stay inside this cover? Or will I need a

duvet cover to go over these 26x26 pillows with 44oz fill?

If I need a devet cover then what thread count do I need to

ensure that the feather quills dont come through?

I appreciate your help.

Ray