Sheer curtains are a great way to make the most of the natural light and create a bright, soft, outdoorsy feeling, whilst maintain that much needed privacy. During the day, a sheer curtain will allow people inside the home to see out through the curtain, without allowing people on the outside to see in. Simple sheers are truly timeless and can work with modern or traditional looks. Most sheer curtains are made of polyester, which is a very friendly and cost effective fabric.