I think that's hessian - burlap - on the shutter frames. Gives the impression of natural linen.
Tire sliding doors w/ steel handles
sliding door aluminium stacking - Google Search
Stenciled Drapes! - Our Fifth House
Such a neat idea for old vintage antique doors..barn door window treatment
alternative to vertical blinds for slider | ... sliding glass doors I like this so much better than vertical blinds
Here are some sliding glass door window treatments with vertical blinds.
Shutter for Sliding Glass Door Track
JTrack Barn Door Hardware
sliding door window coverings | Privacy with a Sliding Door - Amazing Spaces: Blinds, Shades, Shutters ...