Because I had drapes with grommets, this was so easy to install but this can be used with any kind of drape.  Do note the length and when in doubt go a little shorter so it doesn't show under your drape panel.  I had 90" long panels and ordered an 88" liner.  They peeked through along the bottom so I had the shorten to hang by pinning down the hanging loops on top.  It worked.  Blocks out the light beautifully.