Well constructed.  Plain and simple. Light weight.  Airy.  Ecru is darker, (some might say drab!) a medium hue, not softer as you might expect; so curtain will contrast with white frames and walls, rather than 'blend in' as an off-white might.   
Do be careful with quantity selection.  You are ordering (1) one panel, not a pair.   My second panel came quickly.  Yeah, Wayfair!  Great service.