My last house was in the same position as Daffy's. Voile fabric wasn't available when I moved in so, on a trip back to Canada, OH went to our old house and brought back our voiles. I adapted them and they looked gorgeous. Soon after I put them up a lady knocked on the door and said the curtains looked great but she missed being able to look into our house on her way to and from work!
Don't need them now as I live in a cul-de-sac but I have black vertical blinds.. quite see through..... on the back of the house. For sun and privacy.
So I'm with Daffy and as long as they are clean and fall in nice folds nets/voiles can look good.