I will let you in on a secret -- one of the things that interior decorators, architects, or other designers often do is shop. Or rather, window shop, since we mostly do not end up buying anything but add yet another catalogue (or catalogues) to an already excessive collection. These will take up precious space but it will be something that we are ready to forgo because you really need to, first, be aware of what is in the market and, secondly, have a large number of materials to work with.
To the layperson, a sheer fabric is just that -- a sheer fabric. But as designers, we look at how dense the weave is. Is this too sheer? And, hence, does it let in too much light? Does the fabric feature any kind of grain and will it go with the decor? What material is it made of and will it be easy to care for and will it drape nicely after a year or so? Is this fabric suited for layers or will it look better on its own?